Astronomers utilizing the NASA/ESA/CSA James Webb Space Telescope have identified an extraordinary presence of small gas-phase hydrocarbons—such as benzene, triacetylene, diacetylene, acetylene, methane, and methyl radicals—within the concealed core of the ultra-bright infrared galaxy IRAS 07251-0248.
Hydrocarbons are influential in shaping the chemistry of the interstellar medium. However, definite observational constraints on their enrichment and relationship with carbonaceous particles and polycyclic aromatic hydrocarbons remain elusive. García Bernete et al. report Webb infrared observations of the Local Ultraluminous Infrared Galaxy (ULIRG) IRAS 07251-0248, revealing extragalactic detections of small gas-phase hydrocarbons. Image credit: García-Bernete et al., doi: 10.1038/s41550-025-02750-0.
The core of IRAS 07251-0248 (also known as 2MASS J07273756-0254540) is obscured by significant amounts of gas and dust.
This dense material absorbs most radiation emitted by the central supermassive black hole, complicating studies with traditional telescopes.
However, the infrared spectrum can penetrate this dust, providing unique insights about these regions and illuminating vital chemical processes in this heavily obscured core.
Dr. Ismael García Bernete and his team employed spectroscopic observations using Webb’s NIRSpec and MIRI instruments, covering wavelengths from 3 to 28 microns.
These observations reveal chemical signatures of gas-phase molecules alongside signatures from ice and dust particles.
These data empowered astronomers to characterize the abundance and temperature of various chemical species within the core of this concealed galaxy.
Remarkably, they discovered an exceptionally high abundance of small organic molecules such as benzene, methane, acetylene, diacetylene, and triacetylene—the first such detections outside our Milky Way, including the methyl radical.
Additionally, substantial amounts of solid molecular materials, including carbonaceous particles and water ice, were identified.
“We uncovered unexpected chemical complexity, showcasing abundances far exceeding current theoretical models,” stated Dr. García Bernete, an astronomer at the Astrobiology Center.
“This suggests a continuous source of carbon within these galactic nuclei, fueling this rich chemical network.”
“These molecules may serve as vital building blocks for complex organic chemistry, relevant to processes that pertain to life.”
Professor Dimitra Rigopoulou from the University of Oxford remarked, “Small organic molecules may not exist in living cells, yet they could play a pivotal role in prebiotic chemistry—a crucial step toward forming amino acids and nucleotides.”
These findings were published in a recent issue of Nature Astronomy.
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I. Garcia-Bernete et al. Abundant hydrocarbons within buried galactic nuclei with evidence of processing of carbonaceous particles and polycyclic aromatic hydrocarbons. Nat Astron, published online on February 8, 2026. doi: 10.1038/s41550-025-02750-0
Illustration of a Failed Supernova Explosion Forming a Black Hole
NASA, ESA, and P. Jeffries (STScI)
A massive star in the Andromeda galaxy has seemingly vanished instead of exploding, resulting in the formation of a black hole in a peculiar manner.
Typically, black holes originate from stars that explode as supernovas. However, they can also emerge from stars that collapse due to their own gravity, directly creating black holes without the explosive phase.
In 2024, Kisharai De from Columbia University, along with his team, investigated the case of M31-2014-DS1, an exceptionally bright star located in the Andromeda galaxy, approximately 20 times the mass of our Sun. The star exhibited an initial brightening in 2014, followed by a significant dimming from 2017 to 2020. This behavior aligned with predictions for a supernova that would fail to result in a black hole, yet no direct evidence of the black hole was observed, such as X-ray emissions.
Currently, De and his colleagues are utilizing the James Webb Space Telescope (JWST) and Chandra X-ray Observatory to study M31-2014-DS1. They have detected a faint red object at the star’s previous location, which is only about 8% brighter than the original star and enveloped in rapidly expanding dust. This finding aligns with the expected characteristics of a supernova that fails to produce a black hole. However, De and his team have refrained from commenting further, as their research has not yet undergone peer review.
Another group studying the same JWST data, including Emma Beasor from Liverpool John Moores University, UK, suggested that the case for M31-2014-DS1 failing to explode may also indicate a stellar merger, which could result in small explosions followed by dimming and dust formation.
“Predictions for the appearance of a failed supernova significantly overlap with what we might expect from a collision of two stars creating vast amounts of dust,” Beasor explained.
However, both scenarios are rare, she noted, as it is uncommon to observe such drastic color changes in a star.
“No matter the explanation, it’s fascinating that the visible star has essentially vanished,” stated Gerald Gilmore from Cambridge University. “For years, the search for extinct massive stars has produced ambiguous outcomes, but now, advancements in multi-wavelength time-domain astronomy are paving the way for clarity.”
The definitive method for confirming black hole formation is through the identification of X-ray emissions, Gilmore noted, which are currently absent at the M31-2014-DS1 location. Nevertheless, if advanced telescopes like JWST can analyze the remnants of dimmed stars, we could soon uncover what occurred. “We are on the verge of discovering at least one of the ultimate fates of a massive star, which is intriguingly akin to the Cheshire Cat’s disappearance,” he remarked.
Astronomers utilizing the WHT Extended Area Velocity Explorer (WEAVE), a cutting-edge instrument aboard the William Herschel Telescope on La Palma Island, have uncovered an intriguing elongated structure of ionized iron within the renowned Ring Nebula.
A composite image of the Ring Nebula featuring four WEAVE/LIFU emission line images. Image credit: Wesson et al., doi: 10.1093/mnras/staf2139.
The Ring Nebula, also known as Messier 57, M57, or NGC 6720, is a classic planetary nebula located approximately 2,000 light-years away in the constellation Lyra.
This nebula was first discovered by the French astronomer Charles Messier in January 1779 while he was on a mission to find comets.
Messier’s report about the discovery of Comet Bode reached fellow astronomer Antoine d’Alquier de Perpois shortly afterward, who subsequently rediscovered the Ring Nebula during his comet observations.
The newly identified rod-shaped cloud of iron atoms resides within the inner layer of this elliptical nebula.
Measuring about 500 times the length of Pluto’s orbit around the sun, this cloud’s atomic mass of iron is comparable to that of Mars.
This iron cloud was detected using the Large Integral Field Unit (LIFU) mode of the innovative WEAVE instrument on the 4.2-meter William Herschel Telescope, part of the Isaac Newton Group.
According to Dr. Roger Wesson, an astronomer from University College London and Cardiff University: “While the Ring Nebula has been extensively studied with various telescopes, WEAVE enables us to observe it in unprecedented detail, providing much richer information than previously available.”
“By continuously collecting spectra across the nebula, we can image it at any wavelength and analyze its chemical composition at any given location.”
“As we process the data and examine the images, we discover a never-before-seen ‘rod’ of ionized iron atoms at the heart of this iconic ring.”
The exact nature of the iron “rods” within the Ring Nebula remains uncertain.
Two potential scenarios emerge: the bar may offer new insights into the nebula’s formation and ejection by its parent star, or (more intriguingly) it could represent an arc of plasma from a rocky planet evaporating during the star’s initial expansion.
Professor Janet Drew, also from University College London, noted: “We need to investigate further, particularly to determine if the newly detected iron coexists with other elements. This could guide us toward the appropriate models to explore.”
“Currently, this crucial information is lacking.”
For more in-depth details, check out the findings published today in the Royal Astronomical Society Monthly Notices.
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R. Wesson et al. 2026. WEAVE Imaging Spectroscopy of NGC 6720: Iron Rods in the Ring. MNRAS 546 (1): staf2139; doi: 10.1093/mnras/staf2139
This galaxy cluster must be much, much colder than it actually is.
Lingxiao Yuan
Recent discoveries about young galaxy clusters, such as SPT2349-56, are transforming our understanding of how these colossal structures formed and evolved in the early universe. Interestingly, the gas within SPT2349-56 is significantly hotter and denser than anticipated, posing intriguing questions for researchers.
Zhou Daizhi and their team at the University of British Columbia utilized the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile to investigate this galaxy cluster. Their findings revealed that the gas at the cluster’s center reaches temperatures of tens of millions of degrees Celsius.
“The sun’s surface temperature is just a few thousand degrees Celsius, making this region much hotter,” Zhou notes. “Our conservative estimates indicate temperatures five to ten times higher than expected based on simulations, which is surprising since such hot gas was thought to exist only in clusters billions of years old.”
Located in the early universe, approximately 1.4 billion years after the Big Bang, SPT2349-56 is unlike any other known cluster of its age. Zhou explains, “This gas should still be relatively cold and in small quantities, as these nascent clusters are still in the process of accumulating gas and heating up.” However, SPT2349-56 seems to be more mature than anticipated.
The unusual heating could stem from the presence of particularly active galaxies within the cluster, with at least three galaxies emitting massive jets of energy. These jets, combined with intermittent star formation bursts, might be heating the gas rapidly, challenging previous assumptions.
“This discovery opens a new window into understanding stages of cluster evolution that we have not observed before,” Zhou emphasizes. The research team plans additional observations to locate more hot young clusters like SPT2349-56, with the hope of unraveling the complexities of galaxy formation.
In a recent breakthrough regarding human evolution, researchers have unveiled that a peculiar foot unearthed in Ethiopia is from a yet-to-be-identified ancient relative.
The findings, released on Wednesday in the journal Nature, indicate the foot dates back approximately 3.4 million years and likely bears similarities to Lucy, another ancient human relative who inhabited the region around the same period.
However, scientists have revealed that Burtele’s foot, named after the site in northeastern Ethiopia where it was discovered in 2009, is distinctly different.
The fossil of Bartel’s foot has an opposable thumb akin to that of humans, suggesting its owner was a proficient climber, likely spending more time in trees compared to Lucy, according to the study.
Elements of Brutere’s foot discovered in Ethiopia in 2009. Johannes Haile Selassie/Arizona Institute of Human Origins (via AFP)
For many years, Lucy’s species was believed to be the common ancestor of all subsequent hominids, serving as a more ancient relative to humans, including Homo sapiens, in contrast to chimpanzees.
Researchers were unable to confirm that the foot belonged to a novel species until they examined additional fossils found in the same vicinity, including a jawbone with twelve teeth.
After identifying these remains as Australopithecus deiremeda, they determined that Bartele’s feet were from the same species.
John Rowan, an assistant professor of human evolution at the University of Cambridge, expressed that their conclusions were “very reasonable.”
“We now have stronger evidence that closely related, yet adaptively distinct species coexisted,” Rowan, who was not part of the study, communicated in an email to NBC News on Thursday.
The research also examined how these species interacted within the same environment. The team, led by Johannes Haile Selassie of Arizona State University, suggested that the newly identified species spent considerable time in wooded areas.
The study proposed that Lucy, or Australopithecus afarensis, was likely traversing the open land, positing that the two species probably had divergent diets and utilized their habitats in distinct ways.
Various analyses of the newly found tooth revealed that A. deiremeda was more primitive than Lucy and likely fed on leaves, fruits, and nuts, the study indicated.
“These distinctions suggest they are less likely to directly compete for identical resources,” remarked Ashley Los Angeles-Wiseman, an assistant professor at the Macdonald Institute of Archaeology at the University of Cambridge.
In an email on Thursday, Wiseman highlighted the significant implications of this discovery for our understanding of evolution, stating that it “reminds us that human evolution is not a linear progression of one species evolving into the next.”
Instead, she asserted, it should be viewed as a branching family tree with numerous so-called “cousins” existing simultaneously, each adopting various survival strategies. “Did they interact? We may never know the answer to that,” she concluded.
Rowan also noted that as the number of well-documented species related to humans increases, so do the inquiries concerning our ancestry. “Which species were our direct ancestors? Which species were our close relatives? That’s the challenge,” he remarked. “As species diversity ascends, so too do the avenues for plausible reconstructions of how human evolution unfolded.”
Wiseman cautioned that definitive species classifications should rely on well-preserved skulls and fossil fragments belonging to multiple related individuals. While the new study bolsters the case for A. deiremeda, it “does not dismiss all other alternative interpretations,” she stated.
For nearly a century, dark matter has posed a significant enigma. Although it outnumbers ordinary matter by a ratio of five to one, it remains invisible and undetectable by current technology.
A daring new analysis of 15 years of data from NASA’s Fermi Gamma-ray Space Telescope now claims to shed light on this mystery.
The latest research reveals the detection of a peculiar halo-like glow of gamma rays surrounding the Milky Way galaxy, with distinct peaks in energy that align closely with the signals predicted for a specific type of hypothetical dark matter particle.
These particles, referred to as weakly interacting massive particles (WIMPs), can generate gamma rays by annihilating one another.
“If this is validated, it would be the first instance where humanity has ‘seen’ dark matter,” stated Professor Tomonori Toya, an astronomer at the University of Tokyo and co-author of the study.
In an interview with BBC Science Focus, he expressed his initial skepticism: “When I first noticed what looked like a traffic light, I was doubtful, but after careful investigation, I became convinced it was accurate—it was an exhilarating moment,” he shared.
However, despite the excitement surrounding the new signals, independent experts caution that this discovery is far from conclusive.
This possible breakthrough emerges nearly a century after Swiss astronomer Fritz Zwicky first proposed dark matter’s existence, after observing that the galaxies in the Milky Way cluster were moving too swiftly for their visible mass.
Mr. Toya’s study, published in the Journal of Cosmology and Astroparticle Physics, scrutinized 15 years of data from the Fermi telescope, focusing on the regions above and below the Milky Way’s main disk—known as the galactic halo.
After modeling and accounting for known sources of gamma rays, such as interstellar gas interactions, cosmic rays, and massive bubbles of high-energy plasma at the galaxy’s center, he identified a leftover component that shouldn’t exist.
“We detected gamma rays with a photon energy measuring 20 giga-electron volts (or an impressive 20 billion electron volts), extending in a halo-like formation toward the Milky Way’s center,” Toya explained. “This gamma-ray-emitting component aligns with the expected shape of a dark matter halo.”
A gigaelectronvolt (GeV) represents a unit of energy utilized by physicists to quantify subatomic particles’ energy levels—approximately a billion times the energy that a single electron attains when traversing a 1-volt battery.
The potential dark matter signal identified by Toya sharply rises from a few GeV, peaks around 20 GeV, and subsequently declines, consistent with predictions for WIMPs, which possess about 500 times the mass of a proton.
This gamma-ray intensity map illustrates a signal that may originate from dark matter encircling the Milky Way halo. The gray horizontal bar in the central area represents the galactic plane, which was exempted from the analysis to avoid strong astrophysical radiation. – Photo credit: Tomonori Toya, University of Tokyo
In Totani’s perspective, this data significantly indicates the existence of dark matter. “This marks a crucial advancement in astronomy and physics,” he asserts.
Nevertheless, Jan Conrad, a professor of astroparticle physics at Stockholm University in Sweden and an independent expert in gamma-ray searches for dark matter, advises prudence.
“Making claims based on Fermi data is notoriously challenging,” he remarked to BBC Science Focus.
This isn’t the first instance of astronomers witnessing such phenomena; the story stretches back to 2009, shortly after the Fermi telescope’s launch. In that year, researchers identified an unexplained surplus of gamma rays emanating from the galactic center.
For years, this finding stood out as a compelling hint of dark matter. However, Conrad pointed out that even after 16 years, the scientific community has yet to arrive at a consensus about the signal’s dark matter roots.
“It’s believed to be related to dark matter,” he claims. “Despite accumulating data and enhanced methods since then, the question of dark matter’s existence remains unresolved.”
Even at this juncture, researchers who have spent over a decade working to disprove the galactic center excess are unable to definitively prove it is astrophysical in nature (originating from sources other than dark matter), nor can they confirm it is attributable to dark matter. The issue remains unsolved.
Conrad emphasized that the emerging signals from the halo are insufficiently studied and will likely necessitate many more years of investigation for verification. Both the new halo anomaly and the much-debated galactic center signal share a common challenge: noise interference.
In these regions, gamma rays potentially stemming from dark matter annihilation may also originate from numerous other, poorly understood sources—complicating efforts to reach definitive conclusions.
“The uncertainties surrounding astrophysical sources make it exceedingly difficult to assert strong claims,” Conrad stated.
Despite their differing confidence levels, both Totani and Conrad highlight the same forthcoming focus: dwarf galaxies.
These small, faint galaxies orbiting the Milky Way are believed to contain significant amounts of dark matter while exhibiting minimal astrophysical gamma-ray background, rendering them ideal for studying dark matter annihilation.
“If we detect a similar excess in dwarf galaxies, that would provide compelling evidence,” Conrad said. “Dwarf galaxies provide a much cleaner environment, allowing for potential confirmation.”
Dr. Toya concurred, noting, “If the results of this study are validated, it wouldn’t be surprising to observe gamma rays emitting from dwarf galaxies.”
The Cherenkov Telescope Array Observatory (CTAO) is the most sensitive ground-based gamma-ray observatory ever constructed, offering a powerful new approach to scrutinize whether this enigmatic signal is indeed dark matter. – Photo credit: Getty
Yet, the ultimate verification of Toya’s discovery might be closer to home. Experiments designed to detect dark matter are currently taking place in facilities situated deep underground around the world.
“If we were to observe a signal there that aligns with a WIMP of the same mass…that would present a robust argument, as it would be much cleaner,” Conrad pointed out.
In the coming years, the next-generation Cherenkov Telescope Array Observatory (CTAO) will significantly enhance sensitivity to high-energy gamma rays, enabling researchers to analyze halo signals with greater detail.
“Naturally, if this turns out to be true, it’s a significant discovery,” Conrad said. “The true nature of dark matter remains elusive. A clear signal indicating dark matter particles would be monumental. However, further research is essential to explore alternative explanations for this excess.”
Monte Sierpe, meaning “Mountain of the Serpent” and informally referred to as the “Zone of Holes,” is situated in the Pisco Valley of southern Peru. It comprises around 5,200 meticulously aligned holes. Recent studies indicate that the site may have originally functioned as a barter market, bringing together a variety of people for trade.
Aerial view of Monte Sierpe looking northeast. Image credit: Jacob Bongers, University of Sydney.
Stretching over 1.5 km in the Pisco Valley of the southern Peruvian Andes, Monte Sierpe features approximately 5,200 carefully aligned holes (ranging from 1–2 m in width and 0.5–1 m in depth) arranged in distinct sections.
This extraordinary structure likely dates back to at least the Late Middle Period (1000-1400 AD) and was actively used by the Incas (1400-1532 AD).
Initially brought to modern attention in 1933 following an aerial photo published in National Geographic, the specific purpose of the monument remains a mystery.
Speculations about its function include various roles such as defense, storage, accounting, water collection, fog capture, and horticulture, but the actual intent continues to elude researchers.
“What led ancient people to excavate over 5,000 holes in the hills of southern Peru? Were they used for gardens? Did they provide water? Did they serve agricultural purposes?” inquires Dr. Jacob Bongers, a digital archaeologist from the University of Sydney.
“While we cannot ascertain their purpose, our new data offers significant clues and supports emerging theories regarding the site’s utilization.”
Utilizing drone technology, Dr. Bongers and his team mapped the site, uncovering numerical patterns in its layout that indicate intentional organization.
Interestingly, the archaeologists also found that the configuration of Monte Sierpe resembles that of at least one Inca quipu (an ancient knotted string for accounting) discovered in the same valley.
“This discovery significantly enhances our understanding of the origins and variety of indigenous accounting practices both within and outside the Andes,” noted Dr. Bongers.
Soil samples taken from the holes revealed ancient maize pollen, one of the Andes’ key staple crops, along with reeds traditionally utilized for basket making for millennia.
These surprising findings indicate that ancient people likely planted crops in the holes, using woven baskets and bundles for transport.
“This is quite intriguing. Perhaps this area functioned as a pre-Inca market, akin to a flea market,” remarked Dr. Bongers.
“We estimate that the pre-Hispanic population in this region was around 100,000. It likely served as a meeting point for traveling merchants, including llama caravan traders, as well as local professionals like farmers and fishermen to trade goods like corn and cotton.”
“Fundamentally, I believe these holes served as a form of social technology that unified individuals and later evolved into a comprehensive accounting system under the Inca Empire.”
“Numerous questions remain: Why is this monument unique to this location and not found throughout the Andes?”
“Was Monte Sierpe a type of ‘landscape’? – Nevertheless, we are gradually moving closer to unraveling the mysteries of this fascinating site. It’s genuinely exciting.”
Refer to the study published in the Journal on November 10, 2025 ancient.
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Jacob L. Bongers et al. Indigenous accounting and interaction at Monte Sierpe (“Band of Holes”), Pisco Valley, Peru. ancient published online on November 10, 2025. doi: 10.15184/aqy.2025.10237
Paleontologists have discovered a specimen dating back 410 million years: cavernous cavernosa nanum. This lichen is one of the oldest and most extensively distributed in the fossil record and was found in Brazil’s Paraná Basin, specifically within the Ponta Grossa Formation.
Artistically reconstructed cavernous cavernosa nanum from the Early Devonian, depicting high-latitude sedimentary systems of the Paraná Basin. Image credit: J. Lacerda.
The colonization of land and the evolution of complex terrestrial ecosystems rank among the most significant evolutionary milestones in the history of life.
This phenomenon greatly affected terrestrial and marine ecosystems, leading to the sequestration of atmospheric carbon dioxide, enhanced weathering, nutrient absorption in oceans, soil formation, and the emergence of major groups of terrestrial animals.
It is well-established that early plants played a crucial role in land colonization, particularly in establishing the first plant communities.
The earliest records of ancient land plants appear in the form of cryptospores from the Middle Ordovician, around 460 million years ago. The first macrofossils of vascular plants are found in Silurian deposits dating from approximately 443 to 420 million years ago.
Despite this, the specific role and presence of lichens during various stages of terrestrialization remain uncertain.
“cavernous cavernosa nanum displays a partnership of fungi and algae akin to modern lichens,” noted Dr. Bruno Becker Kerber from Harvard University.
“Our research illustrates that lichens are not merely peripheral organisms; they were vital pioneers in reshaping Earth’s terrain.”
“They contributed to the soil formation that enabled the colonization and diversification of plants and animals on land.”
Morphology and internal structure of cavernous cavernosa nanum. Image credit: Becker-Kerber et al., doi: 10.1126/sciadv.adw7879.
Findings indicate that ancient lichens originated in the cold polar regions of the Gondwana supercontinent, now known as parts of modern-day South America and Africa.
“cavernous cavernosa nanum is a remarkable fossil, preserved in an incredible state. Essentially, they are mummified with their organic matter intact,” remarked Professor Jochen Brocks from the Australian National University.
“In simple plants, the tough component is cellulose. In contrast, lichens are unique; they consist of chitin, the same material that gives insects like beetles their strength.”
“Chitin contains nitrogen. In our analyses, cavernous cavernosa nanum yielded an unprecedented nitrogen signal.”
“Such clear results are rare. It was a true Eureka moment.”
“Today, lichens continue to be vital in soil creation, nutrient recycling, and carbon capture in extreme environments spanning from deserts to the polar regions.”
“Yet, due to their delicate structure and infrequent fossil records, their origins remain elusive.”
“This research underscores the necessity of blending traditional techniques with innovative technology,” explained Dr. Nathalie L. Alchira, a researcher at the Synchrotron Light Institute in Brazil.
“Preliminary measurements enabled us to identify crucial areas of interest and collect 3D nanometer imaging for the first time, unveiling the intricate fungal and algal networks that define cavernous cavernosa nanum as a true lichen.”
The team’s study was published in this week’s edition of Scientific Advances.
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Bruno Becker-Kerber et al. 2025. The role of lichens in the colonization of terrestrial environments. Scientific Advances 11(44); doi: 10.1126/sciadv.adw7879
The asymmetry in the average temperature of the cosmic microwave background is inconsistent with the standard model of cosmology
ESA/Planck Collaboration
Cosmic anomalies have puzzled scientists for years, and recent examinations of data from various radio telescopes further complicate the understanding of their origins.
This peculiar fluctuation appears in the afterglow of the Big Bang, representing radiation that has journeyed toward us since the dawn of time, referred to as the cosmic microwave background (CMB). Physicists generally expect this radiation to be uniform in all directions; therefore, significant deviations are perplexing. Current measurements indicate a gradient in CMB temperatures, resulting in colder and hotter areas known as a dipole, as explained by Lucas Behme. His team at Bielefeld University in Germany utilized data from radio telescopes to delve deeply into these anomalies.
Böhme notes that while the presence of the CMB dipole isn’t surprising, its magnitude defies the expectations of our prevailing cosmological models. Radiation emitted from moving sources—and perceived by observers who are also in motion—appears warmer or colder due to the Doppler effect and other relativistic effects. Yet, the dipole observed is approximately ten times more intense than anticipated.
To analyze this discrepancy, Böhme and his colleagues examined data from six radio telescopes and meticulously narrowed their focus to the three most precise measurements. Böhme describes their method as dividing the sky into pixels to determine the number of radiation sources within each. Nevertheless, despite their exhaustive adjustments, the dipole mystery endured.
Dragan Huterer from the University of Michigan finds the team’s thorough analysis noteworthy. He emphasizes that this is crucial for establishing the dipole as an undeniable feature of the CMB. “This is a significant insight, indicating that we fundamentally misunderstand our spatial context within the universe, or that our most accurate theories fail to align with the evidence,” he states. However, Huterer also points out the challenges inherent in accurately measuring radio astronomical data, which may result in systematic errors.
Part of the difficulty lies in the faintness of the radio signals collected, Böhme explains. “We aim to measure extremely subtle phenomena. Fine-tuning this measurement is challenging,” he notes. Yet, this is not the only evidence supporting the existence of the dipole. Infrared radiation from quasars tends to reinforce the findings from radio wave measurements, and forthcoming telescopes may enhance precision in observations, potentially resolving some of the dipole’s enigmas.
The NASA DART probe, depicted on the upper right, is on a trajectory to collide with the asteroid Dimorphos, shown on the left.
Steve Gribben/Johns Hopkins APL/NASA/AP/ALAMY
Following the collision of NASA’s spacecraft with an asteroid, its orbit is expected to change gradually next month, leaving astronomers puzzled.
In 2022, the Double Asteroid Redirect Test (DART) sent a nearly 600-kilometer spacecraft towards a small asteroid known as Dimorphos.
Prior to the collision, Dimorphos completed an orbit every 11 hours and 55 minutes. Observations soon indicated that the impact shortened this orbital period by approximately 30 minutes, although in the following weeks and months, the orbital period diminished by an additional 30 seconds.
Astronomers have proposed that this phenomenon might be due to the release of small debris during the impact, which could gradually cause energy loss and result in a reduced orbital path.
Recently, Harrison Agrusa and Camille Chattanette from the University of Côte d’Azur in Nice, France, asserted that debris ejection cannot solely explain the observations.
“The boulders can be flung by Dimorphos, leading to a wider dispersion. This momentum will eventually revert and be transferred back to Dimorphos,” Agrusa explains.
Agrusa theorizes that a more plausible reason for Dimorphos’ shifting trajectory is that its impact affects its rotation in a complex manner, causing rocks on its surface to shift. The friction generated by these rocks could lead to heat production from their collisions. The resultant energy loss as heat might clarify the decrease in the asteroid’s orbital path, although this study has not modeled that aspect.
“When you rearrange materials on a surface, you’re altering the gravitational potential energy of Dimorphos itself,” Agrusa states. “This adjustment could feasibly slow down the orbital period within a month, as this would be a prolonged process.”
This highlights the challenges in predicting how asteroid orbits will alter post-impact, yet according to Agrusa, this phenomenon is less concerning when deflecting an asteroid heading towards Earth. This is because binary asteroid systems like Didymos and Dimorphos are quite uncommon, making it unlikely that similar effects will occur for a solitary asteroid orbiting the Sun.
The Yunxian 2 skull, although deformed, has been reconstructed to resemble an early Denisovan.
Gary Todd (CC0)
Our species’ origins may extend further back than previously believed, and the same could hold true for both our extinct Neanderthal and Denisovan relatives. A recent analysis of fossil remains suggests that the common ancestors of these groups emerged over a million years ago.
“If these ancient divergences are accurate, we might be overlooking significant details about the early history of these lineages,” states Chris Stringer from the Natural History Museum in London.
This finding could clarify the search for “ancestor X,” the lineage from which modern humans, Neanderthals, and the population that produced the Denisovans descended. It also may imply that the Denisovans were our closest relatives, potentially even closer than Neanderthals—a point that remains debated.
Stringer and his research team, which includes Xijun Ni from the Institute for Vertebrate Paleontology and Paleoanthropology in Beijing, revisited the Yunxian fossil collection located in central China.
Two partial skulls were unearthed on a terrace above the Han River in 1989 and 1990; reported in 1992. Both skulls were crushed during their discovery, although the YUNXIAN 2 specimen sustained less damage.
Using advanced techniques, Stringer, Ni, and their colleagues reconstructed the Yunxian 2 skull. These methods include CT scans that digitally separate individual bone fragments from the surrounding sediment. “The skull is elongated and has a prominent brow ridge,” Stringer notes. “Additionally, it features a slight beak-like nose, small third molars, and larger teeth.”
The Yunxian 2 skull dates back between 940,000 and 1.1 million years. Specimens of this age are often classified as Homo erectus, which appeared around 2 million years ago in Africa before dispersing to South Asia and Indonesia approximately 108,000 years ago. However, Stringer asserts that Yunxian 2 doesn’t conform to this profile; many of its features are characteristic of later specimens, including Neanderthals.
To better understand the Yunxian 2, the research team compared it with 56 other fossils of the same group. They constructed a family tree based on the morphology, grouping related fossils together. This analysis revealed three significant lineages, encompassing most fossils from the past million years.
One lineage consists of modern humans (Homo sapiens), another includes Neanderthals (Homo neanderthalensis) who lived in Europe and Asia for several hundred thousand years before disappearing around 40,000 years ago, and the third represents the Denisovans from East Asia.
Denisovans were first identified in 2010 through DNA from a bone fragment, and it took 15 years to connect this lineage with larger fossils. Stringer was involved in interpreting the Harbin skull from China, which was identified as Denisovan in June based on molecular evidence. Yunxian 2 appears to fall into the early Denisovan category, much like several other Asian fossils.
This discovery provides important links among these fossils in the Denisovan lineage, according to geneticist Aylwyn Scally at Cambridge University: “This allows us to form better hypotheses about the Denisovans’ whereabouts, lifestyle, and species characteristics.”
Recognizing that Yunxian 2 is a Denisovan reshapes our recent understanding of human evolution in two significant ways. First, it appears to alter the timeline of the emergence of these three groups. Traditional genetic narratives suggest that the common ancestor, “ancestor X,” diverged into two branches. However, the reconstruction indicates that Neanderthals separated first about 1.38 million years ago, before the divergence of modern humans and Denisovans around 1.32 million years ago.
If validated, this hypothesis posits that Denisovans were indeed more closely related to us than Neanderthals, challenging established genetic theories. Nonetheless, Scally expresses caution, noting the complexities of inter-group histories: “In reality, straightforward phylogenetic trees don’t provide a complete picture.” The research relies more on “entangled networks” than traditional models. Furthermore, Scally suggests that genetics may provide clearer insights into these relationships than morphology, especially with only partial skeletal evidence available.
The second significant change is that all three groups appear to have emerged much earlier than previously thought. Genetic evidence generally indicates that modern humans split from their Neanderthal and Denisovan relatives around 500,000-700,000 years ago. However, Yunxian 2 suggests that the Denisovan lineage was already distinct one million years ago.
Scally adds that there may not be a single definitive date for these splits; instead, they likely occurred over extended periods with intermittent separations and reunions. In this case, Stringer and his colleagues may be correct that divergence began over a million years ago, stretching across hundreds of thousands of years.
This extended timeline raises new questions. The oldest known fossils of modern humans date to around 300,000 years ago. So where are the earlier ancestors from millions of years ago? “We either lack those fossils, or they’re present but unrecognized,” Stringer comments.
We also know little about “ancestor X”—its appearance and habitat remain a mystery. “Ten years ago, I would have stated that the likely origin of most of these groups was Africa,” Stringer reflects. “It now seems plausible that their forebears lived outside Africa, potentially in regions of Western Asia. This suggests that ancient sapiens ancestors likely migrated to Africa, evolving there for a large portion of that million-year timeline.”
Stringer highlights the scarcity of known fossils from Western Asia dating back a million years, noting that even India has limited evidence. Only one human fossil from that period exists. “There are numerous regions where our fossil record is strikingly thin,” he asserts.
A significant source of information is the Yunxian site. In 2022, a third skull was uncovered that seems to be in better condition, although it has yet to be analyzed.
Neanderthals, Ancient Humans, Cave Art: France
Join New Scientist’s Kate Douglas on an enthralling journey through time as she delves into significant Neanderthal and Upper Paleolithic sites across southern France, from Bordeaux to Montpellier.
The unusual “leopard spot” markings on Mars’ rocks might finally indicate that alien microbes could have existed on the Red Planet.
A comprehensive analysis of these rocks has shown that the intricate patterns are “the clearest signs ever found on Mars,” as stated by Sean Duffy, a NASA representative.
These rocks, estimated to be about 3.5 billion years old, were discovered in July 2024 by NASA’s Perseverance rover. Since then, planetary scientists have been exploring various hypotheses to explain these markings.
Recent information from a Nature paper suggests that while the patterns may have a geological origin, the prevailing theory now points toward ancient Martian microbes as the likely culprits.
Perseverance collected rock samples, hoping to yield a more definitive answer. If all goes well, these samples will eventually return to Earth for a thorough examination of potential signs of past life.
Leopard Spots on Bright Angel
Currently, Mars is a barren, lifeless world, but this hasn’t always been the case. Until around 3 billion years ago, Mars’ surface was rich with flowing rivers and expansive lakes.
Wherever there is water on Earth, signs of life typically follow. For two decades, NASA’s rovers have been scouring Mars for evidence suggesting that the Red Planet could have once supported life.
The Perseverance rover is exploring a site known as Jezero Crater, which was a lake in Mars’ ancient history. Similar environments on Earth often serve as habitats for microorganisms.
Within rock formations referred to as the Bright Angel formation, Perseverance uncovered stunning patterns resembling leopard spots.
“We conducted extensive observations of the entire rock formation at Bright Angel,” said Professor Joel Hurowitz of Stony Brook University in the US, in an interview with BBC Science Focus.
While Perseverance’s cameras captured detailed images of the patterns, a spectrometer analyzed the mineral composition. The rover even utilized radar to map the structure of the subsurface outcrop.
“Essentially, we used every tool available on these rocks except for the kitchen sink,” Hurowitz remarked.
The analysis indicated that the patterns were formed by iron-rich minerals called vivianite and greygite. On Earth, these minerals typically arise from “redox reactions,” a process in which microorganisms exchange electrons with their environment.
“On Earth, these reactions are often facilitated by microorganisms residing in sediments, which derive energy from them for metabolic activity,” Hurowitz explained. The residuals from these processes create distinctive patterns in sedimentary rocks.
However, this doesn’t mean we should rush to celebrate the discovery of alien life just yet. There are other mechanisms that could account for the leopard spot patterns without any biological influence.
For instance, heat could have driven reactions between mud and organic matter, resulting in new minerals.
Yet, the research team did not find evidence indicating that the rocks were subjected to heat. Additionally, other methods they investigated also did not seem viable. Nonetheless, Hurowitz cautioned, “We cannot dismiss these entirely.”
One of the most surprising findings is the relatively young age of these rocks. At only 3.5 billion years old, the patterns formed while Mars was already entering a phase of decline, suggesting that the planet may have been habitable for much longer than previously assumed.
Unfortunately, Perseverance has an entire planet to explore and we continue our quest to find life beyond Earth.
Perseverance drilling and photographing rock samples – Credit: NASA/JPL -CALTECH/MSSS
“If I could revisit Jezero in the future, I would have follow-up questions that I would like to address using the rover’s instruments,” Hurowitz remarked.
“However, these follow-up analyses may not necessarily provide a more conclusive answer regarding whether these features were shaped by life.”
“Ultimately, determining whether life was involved will necessitate laboratory analysis back on Earth.”
Bringing Mars to Earth
Fortunately, Perseverance is part of the initial phase of Mars’ sample return mission. Not only is it studying the rocks on Mars, but it’s also preparing to bring samples back to Earth.
Before departing from Bright Angel, the rover collected and stored samples from the rocks along with numerous similar fragments obtained during its mission on Mars.
NASA aims to collaborate with the European Space Agency on follow-up missions to retrieve these samples and return them to Earth where they can be analyzed in top-tier laboratories.
After 3.5 billion years, finding definitive evidence is challenging. Instead, researchers will seek additional signs that microbes may have left behind.
“The first logical step is to analyze the isotopic composition of iron, sulfur, and carbon in the various mineral and organic components of the rock,” Hurowitz stated.
Isotopes can be thought of as different variants of the same element. Microorganisms tend to retain particular isotopes more than their non-biological counterparts, enabling researchers to narrow down their search for evidence of life.
“These variations in isotopic composition are essential tools for investigating biological signals in ancient rocks on Earth, and we aim to apply similar methods to this Martian sample,” Hurowitz noted.
The return mission is tentatively scheduled for the 2030s, although there is a risk of cancellation due to cuts to NASA’s planetary exploration budget during the Trump administration.
“NASA is examining strategies for retrieving these samples and others,” a NASA spokesperson told BBC Science Focus. “Having explored Mars for 60 years, we will continue to look into budgetary and timing considerations for a quick and cost-effective return of these samples.”
“We hope these findings will further motivate the sample return mission,” Hurowitz added. “This will allow us to scrutinize the sample with the detail necessary to determine its historical record of life on Mars.”
“If it’s indeed life, that would suggest our planet is not the only one where life has evolved,” Frowitz concluded. “If life originated twice, how many other places might it have occurred?”
About Our Experts
Joel Hurowitz is an associate professor in the Department of Geoscience at Stony Brook University in New York, USA. He investigates the early history of Mars through measurements taken from planetary studies and Earth’s similar topographies.
Stone circles are remnants of ancient rituals and druidic lore. Most people recognize the stone rings at Stonehenge, located near Amesbury, England; which dates back to 2500 BC (around 4,525 years ago). However, numerous examples of “menhills” (standing stones) and other ancient stone arrangements can be found globally.
In fact, some of these stone monuments predate Stonehenge. For instance, the Oyyu Stone Circle in Northern Japan is estimated to be about 3,500 years old, having been discovered in 1931. Additionally, there are various Aboriginal stone circles throughout Australia; some of which may be nearly 10,000 years old.
Conversely, stone monuments are uncommon in America. Thus, in 2007, archaeologists were thrilled to uncover what seems to be a human-made stone arrangement at the bottom of Lake Michigan.
One archaeologist, Mark Holly, has since been seeking funds to drill at the site while keeping its exact location confidential to prevent disturbances.
Currently, the origin of these stones remains unclear. One theory suggests that they may indicate “driving lanes” for caribou hunting, reflecting a different study. 9,000-year-old stone arrangements found on Lake Huron would have been visible when the lanes were marked.
Lake Michigan remained dry until approximately 15,000 years ago. Therefore, these stones might have been arranged significantly earlier than those found at Lake Huron or Stonehenge.
This article addresses the inquiry by John McPherson from Ripon: “Are there any other stoneworks?”
For further questions, please email us at Question @sciencefocus.com or reach out viaFacebook, Twitter, or Instagram. (Make sure to include your name and location.)
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A peculiar fossil skull discovered in a Greek cave over six decades ago may finally reveal some of its mysteries. Recent analysis indicates that at least 300,000 years ago, the early Homo sapiens coexisted with the first Neanderthals in Africa and Europe.
Unearthed in northern Greece in 1960, the Petrarona skull has long puzzled paleontologists, who are challenged to place it within the human lineage.
The fossil includes traits from Neanderthals and Homo erectus, yet it was found completely isolated, lacking artifacts or animal bones that could provide context for dating.
“The moment I examined and measured it, I realized it wasn’t a Neanderthal or Homo erectus,” stated Professor Chris Stringer, a paleontologist and co-researcher at the Museum of Natural History in London, in an interview with BBC Science Focus. “It was something unique.”
Stringer has long believed that the specimen belonged to our relative, Homo heidelbergensis, a robust human species that existed hundreds of thousands of years ago across Africa, Europe, and possibly Asia.
However, without a reliable date for the skull, understanding its place in the human narrative remained difficult.
A recent study utilized uranium series dating on the fossil’s calcite coating.
Calcite, one of the most common mineral forms of calcium carbonate, forms as water seeps into the pores and cavities, resulting in new mineral structures. This uranium series dating method estimates fossil ages by analyzing the calcite and measuring the decay level of uranium within it.
The findings suggest an age of approximately 286,000 years. Nevertheless, the methodology raises questions about the skull’s actual age.
“If fossil calcite forms swiftly after deposition in the cave, an age of around 288,000 to 290,000 years is plausible for the fossil,” Stringer noted.
“However, if the fossil was in the cave before the calcite developed, that age is a minimum estimate.”
The Petrarona skull, partially coated with calcite, is now estimated to be nearly 300,000 years old – Credit: Chris Stringer
Despite this caution, the timeline for Petrarona now closely aligns with another well-known Homo heidelbergensis skull from Kabwe, Zambia, which dates back about 300,000 years.
“Morphologically, they are similar and seem to be converging in their dating,” Stringer remarked.
This discovery underscores the idea that Homo heidelbergensis had a broad geographic presence and an extensive time span, overlapping rather than directly giving rise to other human species.
In simpler terms, contrary to earlier beliefs, they are not the common ancestors of modern humans and Neanderthals; Homo heidelbergensis was likely our contemporary for at least some time.
Stringer emphasized that this enriches our understanding of human evolution.
Unusual clouds form on the Arcia Mon, a volcano on Mars every year.
ESA/DLR/FU Berlin/J. Cowart CC by-sa 3.0 Igo
The delicate clouds that appear on Mars annually have intrigued astronomers since their initial discovery, likely stemming from a water-rich atmosphere that seems implausible.
Each winter, clouds spanning 1,800 kilometers form near the Arsia Mons, located in the southern hemisphere of Mars, emerging and dissipating daily for nearly three months. The atmospheric conditions on Mars vastly differ from Earth’s, notably with an abundance of fine dust particles that can cause water vapor in the atmosphere to condense into cloud particles. This results in cloud patterns unique to Mars, yet simulations accounting for these high dust levels do not replicate the distinct features of the Arsia Mons Cloud.
Now, Jorge Hernandez Bernal from the University of Sorbonne in France and his team propose that an exceptionally high amount of water vapor in the atmosphere could recreate these cloud characteristics. Elevated levels of water vapor aid in cloud particle formation through alternative dust-free processes known as homogeneous nucleation.
When researchers conducted atmospheric simulations around Arsia Mons that featured increased water content, the resulting cloud formations bore a striking resemblance to the actual clouds.
“Uniform nucleation necessitates much greater water levels on Mars. [Water] saturation is required. Initially, I believed this to be improbable or extremely unlikely on Mars,” said Hernandez Bernal at the Europlanet Science Congress (EPSC) on September 10th, held in Helsinki, Finland. “However, over the last decade, we’ve discovered that Mars can indeed exhibit supersaturation.”
Small, toothed mammals represent the most unusual of all whales. If they were still around today, they would be as symbolically Australian as kangaroos. A new paper published this week in The Linnaean Society’s Journal of Zoology details a recently identified species named Janjucetus lullardi, derived from a 25 million-year-old specimen unearthed in Victoria, Australia.
Janjucetus lullardi — 25 million years ago, a calf and its mother swam in the shallow waters off the coast of Victoria. Image credit: Ruairidh Duncan.
“Currently, some of the most iconic species of whales, including blue and humpback whales, are whale veil.” I noted, said LeAilid Duncan, a paleontologist from Monash University.
“These marine giants utilize a hairy filter in their mouths called Baleen to sift through plankton.
“In contrast, these mammals had bodies measuring less than 3 meters, with large eyes and short jaws filled with teeth.”
“Despite this description, we know that mammalian whales lacked Baleen.”
“They appeared to be derived from the major evolutionary lines leading to today’s toothless giants.”
All known mammalian species thrived during the late Oligocene epoch, approximately 27 to 23 million years ago.
Interestingly, three of the four identified species were found along the Victoria Surf Coast, southeast of Melbourne.
“The first mammal was uncovered in 1932 and was named in 1939 Mammalian Coraliber,” the paleontologist remarked.
“It featured a blunt jaw bone with a rich supply of blood and nerves for its facial and lip muscles.”
“Notably, the teeth show signs of wear on the gums, indicating they foraged for abrasive prey (along with gritty substances) from the seafloor.”
“In 2006, a local naturalist discovered the first fossil of a species named after him, Janjucetus hunderi.
“This whale had a sturdy triangular snout with sharp teeth and strong muscles to close its powerful jaw.”
“However, the exact differences in the lifestyle of Mammalian Coraliber and Janjucetus hunderi compared to other whales remain largely unclear, hinting at a diverse range of behaviors.”
The fossilized remains of Janjucetus lullardi, dating back 25 million years, were found in 2019 by school principal Ross Dallard along the coast of Yang JUC in Victoria.
“Janjucetus lullardi measured about 2 meters in length. It’s compact enough to fit in a standard single bed,” the researcher noted.
“This may be the first fossilized whale discovered in Australia, and potentially the first fossils of a juvenile whale found in this region.”
____
Ruairidh J. Duncan et al. 2025. Insights into the mystiology of immature teeth from the Australian Oligocene and mammals (Cetacea: Mysticeti) morphology, phylogenetics, and ontogeny. The Linnaean Society’s Journal of Zoology 204 (4): ZLAF090; doi: 10.1093/zoolinnean/zlaf090
This excerpt is from our human stories newsletter, focused on the archaeological revolution—sign up to receive it monthly.
In human stories, I aim to address common questions about human evolution. In February 2021, I tackled a query that many find perplexing—whether Neanderthals and modern humans are distinct species (short answer: species boundaries are ambiguous).
This month, we confront another frequently asked question: Do Denisovans, the extinct human group once prevalent in Asia, have a designated species name? If so, what should that name be?
The debate regarding the “official” name of the Denisovans has been lively since their discovery in 2010. Notably, in June, the skull of Harbin, dubbed the Dragon Man from northern China, was classified as Denisovan through molecular evidence. This marked the first acquisition of a Denisovan skull, giving us insights into their facial features.
While participating in New Scientist discussions, host Rowan Hooper asked why Denisovans lack a species name. Why can’t we refer to them as Homo Denisovanensis, similar to how Neanderthals are called Homo Neanderthalensis?
I preferred a straightforward explanation: insufficient information has hindered a definitive classification of Denisovans. Their DNA shows significant divergence from Neanderthal DNA; yet, we require detailed insights into their anatomy and skeletal structure.
However, this inquiry is multifaceted. First, we must identify which fossils unequivocally belong to Denisovans. This involves analyzing numerous specimens and decades of research, complicating the resolution. Secondly, we need to determine which of the assigned names should take precedence under our classification norms—a legal question that adds to the complexity.
Who’s Included and Who’s Excluded?
A brief reminder about Denisovans: they are an enigmatic group of humans initially identified in 2010 from fragments of a finger bone discovered in the Denisova Cave in Siberia’s Altai Mountains. Genetic analysis revealed they were distinct from both modern humans and Neanderthals. Moreover, many contemporary individuals, especially in Southeast Asia and Melanesia, carry Denisovan DNA.
This suggests that Denisovans were quite widespread in East Asia over the past several hundred thousand years. So, where are the Denisovan fossils?
Fifteen years later, a handful of Denisovan fossils have been actively categorized. For example, mandibles discovered on the Tibetan Plateau were identified through fossil proteins and sediment DNA. Similarly, a jawbone retrieved from the Pengle waterway off the coast of Taiwan was confirmed as Denisovan in April.
Nonetheless, we still lack a complete skeleton. Identifying the Harbin skull as Denisovan brought us closer to understanding their appearance, yet many more discoveries are necessary.
Numerous human fossils in East Asia potentially belong to Denisovans. However, categorizing these remains has proven challenging, as they often do not resemble established species like modern humans, Neanderthals, or even Homo Erectus. If adequate specimens surface, thus confirming their Denisovan identity, our understanding could significantly improve, leading to a formal classification.
But how do we determine which fossils are Denisovan? Ideally, we seek molecular evidence of preserved DNA or protein for comparison with the original Denisovan remnants. However, many fossils remain unanalyzed or inaccessible.
One notable effort to address this issue was a preliminary study submitted by a team led by Xijun Ni from the Chinese Academy of Sciences in March 2024. By comparing 57 human fossils for various physical traits, they constructed familial relationships between these findings.
The team found three primary groups among Eurasian hominins: Modern Humans, Neanderthals, and a third group composed of the original Denisovan fossil, the Tibetan cave jawbone, the Pengle jawbone, and the Harbin skull. This third category appears to represent those we refer to as Denisovans.
This is an intriguing proposition, but others disagree.
A collection of contentious fossils from Hualongdong, southern China, offers a wealth of material: an almost complete skull, 14 teeth, an upper jaw, six isolated teeth, and additional fragments dating back around 300,000 years.
While the NI team classified the Hualongdong specimens as part of the Denisovan group, a study led by Xiujie Wu in July suggested that these teeth did not show clear correlations, proposing instead that they may belong to a different hominin group. Another interpretation could be that the Denisovans at Hualongdong were somewhat disparate from those in other regions.
In the meantime, other intriguing fossils from Asia continue to emerge. Among them are specimens from Dariscal and Jinniushan, both around 260,000 years old, which Ni’s team has suggested might also belong to the Denisovan lineage.
As the list of contending Denisovan fossils grows, we must decide how to categorize them.
The Harbin Skull
Hebei Geo University
Homo — What Does It Mean?
Interestingly, I was part of the team that described the Harbin skull in 2021, and we named it Homo Longhi. So, could that be the name we assign to Denisovans?
However, last year a competing proposition was put forth by Woo and Christopher Beh from the University of Hawaii, who suggested that we should center around fossils from Xujiayao in northern China, proposing to call this new species Homo Jurensis—fossils that would include the original Denisovan findings.
This idea’s strength lies in the resemblance of Xujiayao fossils to Denisovan remains, a point also observed by the NI team. However, Bae and Wu aimed to designate the Xujiayao fossils as “type specimens.”
This raises two issues: the classification of fossils and the naming protocols. Let’s examine each aspect separately.
In classification, the Homo Jurensis proposal faces challenges. Bae and Wu classify the Harbin skull as Homo Jurensis or Denisovan, yet it lacks sufficient resemblance to warrant such designation. A study published in June demonstrated molecular evidence clearly linking the Harbin skull to Denisovans. Hence, identifying those fossils as Denisovan would contravene objective realities, making Homo Jurensis seem unfounded.
What about taxonomy? This area is intricate. A crucial factor is the concept of priority, where the first proposed name tends to gain precedence. Hence, Homo Longhi might likely take precedence over Homo Jurensis as it was suggested three years earlier.
Are there alternative names for Denisovans?
The excavators of Denisova Cave never formally classified Denisovans as a distinct species. Anatoly Derebianco, part of that team, suggested the name Homo Sapiens Altaiensis, implying they would serve as a modern human subspecies—yet this proposal lacked formal status, rendering it typically insignificant.
This year, Derebianco has published a series of papers discussing what Denisovans could be. His references include locations in Mongolia, Uzbekistan, Tajikistan, and Iran, referring to them collectively as Homo sapiens denisovan. I remain unsure if formal explanations were provided, as only abstracts were published, and if completed, it occurred post the naming of Homo Longhi.
Lastly, it’s possible that one of the names was assigned to an Asian human fossil within an obscure publication decades ago. If the fossil is ultimately identified as Denisovan, the name takes precedence (assuming it was adequately introduced). Nevertheless, Wu, Bae, Ni, and others assessed this notion in 2023 and concluded that many crucial fossils were not appropriately named. For instance, there was a suggestion to label Dali’s skull as Homo Dariensis, yet such ideas amounted to informal statements rather than formally recognized classifications.
Your head might be swirling from this cascade of names and species classifications, so let’s recap: the critical takeaway is our evolving understanding of Denisovans, which brings us closer to officially designating their name.
Given our comprehension of taxonomic norms and their significance, Homo Longhi could emerge as the official designation. Although I can’t influence the decision, they will always remain Denisovans in my mind.
Could the gravitational wave signal be from a black hole or something more peculiar?
Titoonz / Alamy
Exotic viscous stars might emulate signals from black holes, mirroring the ripples in spacetime.
Since 2015, scientists have been uncovering the universe’s secrets by monitoring both light waves and gravitational waves, the ripples in the cosmos. Jaime Redondo-Yuste from the Neals Bohr Institute in Denmark and his team found that they can reflect gravitational waves, similar to light waves, but only from unusually viscous celestial objects.
The researchers began exploring the possibility of creating a gravitational wave mirror. While earlier studies hinted at its feasibility, developing equations that adhere to physical laws proved challenging. They eventually understood that reflectors don’t need to be flat.
“We can have a spherical mirror, and we need stars,” explains Redondo-Yuste. However, these stars must possess an extraordinarily high viscosity akin to molasses. Their calculations indicated that such stars could indeed reflect gravitational waves, as they are too rigid to be disturbed by passing waves.
Daniel Kennefick from the University of Arkansas highlights that this behavior is rare since most materials are transparent to gravitational waves, just as glass is to light. “Even when we are very near sources of powerful gravitational waves, they pass through us without any noticeable effect,” he remarks.
In addition to their strangeness, stars capable of deflecting gravitational waves must be compact and on the brink of collapsing into black holes. Redondo-Yuste notes that black holes themselves are very viscous. Therefore, when gravitational wave signals reach Earth, other highly viscous objects could be misidentified as black holes, with subtle differences in their signals. For instance, collisions between viscous stars and black holes would yield slightly distinct gravitational wave signatures due to tidal influences.
Researchers have previously detected celestial bodies believed to have heightened viscosity, such as extremely hot neutron stars formed from the merger of others. However, it’s still uncertain whether these stars possess sufficient viscosity to align with the team’s mathematical model, according to Paolopani from the University of Sapienza in Rome, Italy.
He suggests that forthcoming gravitational wave detectors will enhance our understanding of the viscosity of known objects and assist in discovering new ones. “This serves as a prelude to what we should be searching for,” Kennefick says.
To date, observational data hasn’t provided strong evidence for classifying what scientists identify as a black hole as an exotic star. All three researchers agree that the likelihood of observing these viscous stars has been minimal thus far.
“However, it’s our responsibility to continue these investigations,” insists Redondo-Yuste. “Only in this way can we compile a complete catalog of the entities populating our universe.”
Mars may appear spherical, yet it is actually a triaxial ellipsoid. Unlike the other rocky planets in our solar system, which resemble rugby balls, Mars varies in size along all three axes.
This is most apparent in the notable bulge of the Tharsis rise region and the contrasting region known as Sirtis Major.
Astronomer Dr. Michael Efroysky of the US Navy Observatory recently proposed that this peculiar shape may be attributed to the absence of an ancient moon on Mars.
The moon, named Nerio after the Roman goddess of war, who was associated with Mars, influenced the shape of the planet through tidal forces, similar to the oceans here on Earth.
However, once Mars cooled down, its deformed shape became permanently fixed.
Mars is roughly half the size of Earth, with a diameter of 6,790km (4,219 miles) compared to Earth’s 12,750km (7,922 miles) – Credit: Mark Garlic via Getty/Science Photo Library
Nerio’s tidal stress weakened the elevated regions of Mars, facilitating the impact of geological processes such as internal convection, structural shifts, and volcanic activity, all of which contributed to Mars’ asymmetrical shape.
Researchers propose that, in synchronous orbit around Mars, Nerio—being less than a third of Earth’s mass—could easily have formed the planet’s initial triaxial shape. The equatorial bulge would have been even more pronounced if Nerio had existed during the planet’s magma ocean phase.
Currently, Mars lacks such a moon, having only the small moons Deimos and Phobos. At some point, Nerio was either destroyed by another large body or pulled away by gravitational forces.
This article answers the question posed by Otto Sykes in an email: “Why does Mars have such a strange shape?”
Please email us to submit your questionsat Question@sciencefocus.com or message us onFacebook,Twitter, orInstagramPage (don’t forget to include your name and location).
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Researchers have found that endangered species of killer whales in the Pacific Northwest utilize tools crafted from kelp for mutual care.
A new study published in Current Biology reveals that scientists observed the Southern resident whales producing tools by tearing bull kelp and rolling it between each other during social interactions.
Drone footage captured the kelp being pushed against a companion, revealing a whale engaged in an extended grooming session.
“What’s particularly remarkable is that although this behavior appears to be common, despite the regular drone observations over these whales for nearly 50 years, it has never been documented.” stated Lead author Dr. Michael Weiss from the Whale Research Center in Friday Harbor, Washington.
The endangered Southern resident population has fewer than 80 individuals residing in the Salish Sea, situated between British Columbia and Washington.
While tool use is well recognized among primates, elephants, and birds, it remains scarce in marine species.
Weiss and her team observed this behavior across various age groups and social units, noting that whales are more inclined to groom relatives or older companions.
Two whales interact by rubbing against each other. These scrubs may serve hygienic functions. – Whale Research Center, NMFS NOAA permit 27038
Whales with greater amounts of dead skin participated more frequently in this behavior, suggesting a connection to hygiene.
The findings underscore the cultural identity of Southern residents and emphasize the necessity of conservation efforts. It remains uncertain whether this tool-assisted grooming is exclusive to this group or if it occurs in other whale populations.
Weiss remarked, “It was incredibly thrilling to discover that whales are not just utilizing tools but employing them in ways previously unreported in marine mammals.”
The lines of galaxies that emerged after the collision of the two dwarf galaxies, which tore gases from one another.
Keim et al./Decals
A curious dwarf galaxy may have originated from a bullet-like collision in the universe.
Michael Keim from Yale University and his team employed the Keck Observatory in Hawaii to examine the distinctive trails of 12 small dwarf galaxies located approximately 75 million light-years from the Milky Way.
The orientation and velocity of the galaxies indicate that they resulted from a head-on impact between two galaxies known as NGC 1052-DF2 and NGC 1052-DF4. This collision expelled gas, which eventually coalesced into a group of stars due to gravitational attraction.
“They’re exceptionally unique,” states Kayme. “This is the only known system of its kind.”
Keim and his colleagues named this system after a similar cluster of large galaxies referred to as Bullet Clusters.
It is believed that the two galaxies collided at a speed of 350 kilometers per second around 9 billion years ago. As they passed through one another, gas was stripped from each galaxy. “While it’s improbable for two stars to collide,” notes Kayme, “the same does not apply to gas clouds.”
Interestingly, the remnants of stars left after the collision appear to lack dark matter. This is quite unusual, as most galaxies contain a substantial amount of dark matter, often comprising over 90% of their total mass.
Keim and his team theorize that this anomaly may stem from dark matter’s inability to interact with regular matter during the gas stripping process or because it remained unaffected by the interaction.
This finding may challenge alternative theories regarding dark matter, which posit that discrepancies in stellar and galactic behavior stem from gravitational effects rather than the existence of dark matter particles. “This suggests that dark matter is indeed a particle that can be separated from a galaxy,” explains Kayme.
Fast Radio Bursts (FRBs) represent one of the greatest mysteries of the universe in our time. Initially identified in 2007, these transient radio wave phenomena have perplexed astronomers ever since.
Although we have detected thousands of them, the precise causes, origins, and unpredictable behaviors of FRBs remain elusive.
Just when scientists thought they were starting to unravel the mysteries, two new studies published in January 2025 added twists to the ongoing FRB enigma, challenging earlier theories.
“The FRB is one of those cosmic mysteries that deserves to be solved,” states Dr. Tarraneh Eftekhari, a radio astronomer at Northwestern University, in reference to the first new paper published in Astrophysics Letter.
Though the solution may be a long way off, the universe continues to guard its secrets.
What Makes the FRB Mysterious?
While it may not be entirely accurate to say that FRBs were discovered purely by chance, their initial detection happened within data collected for an entirely different purpose.
Pulsars, or “pulsating radio sources,” are far better understood cosmic phenomena, having been discovered in 1967 by Professor Jocelyn Bell Burnell, arising from neutron stars. These are incredibly dense remnants of giant stars boasting magnetic fields far stronger than Earth’s.
These rapidly spinning stellar remnants emit regular pulses of radio waves akin to cosmic beacons.
The consistency of these pulses and their emissions at specific frequencies initially led to the hypothesis that they could be of natural origin, which earned the first pulsar the nickname “Little Green Man 1.”
While pulsars quickly found their rightful place in astrophysics, FRBs tell a different story.
Jump forward to 2007 when they emerged unexpectedly from data gathered by the Parkes Multibeam Pulsar Survey, an international collaboration involving Jodrell Bank Observatory, Massachusetts Institute of Technology, Bologna Astronomical Observatory, and Australia’s National Facilities.
The emission from this event was so powerful that it overshadowed all other known sources at the time by a substantial margin.
“In terms of energy output, a 1-millisecond-long FRB can emit as much energy as the Sun produces over three days,” says Dr. Fabian Djankowski, an astrophysicist at the French National Centre for Science and Technology specializing in FRBs.
However, for over five years after the initial detection, no similar events were recorded. Skepticism faded as more FRBs began to emerge.
Thousands have been detected since then, and astronomers estimate that two or three FRBs may blaze across the sky every minute.
These enigmatic signals release immense energy from deep space, illuminating the sky with their mysterious nature. And the strangeness does not end there.
Initially, FRBs were believed to be one-off occurrences, cosmic anomalies. This assumption seemed valid, as follow-up observations failed to reveal any repeating sources.
That changed in 2016 when FRB 121102 was found to emit repeated bursts. Currently, between 3% and 10% of FRBs are classified as “repeaters.”
Why do some FRBs remain silent after a single burst, while others emit multiple bursts? This is yet another mystery awaiting resolution.
read more:
What Causes FRBs?
Numerous hypotheses have been proposed regarding the cause of FRBs, ranging from chaotic black hole collisions to extraterrestrial signals. Many explanations have emerged, including the unlikely scenario of a microwave being accidentally detected. However, one candidate seems to rise above the rest.
“When massive stars collapse and go supernova, they leave behind highly magnetized neutron stars, or ‘magnetars,'” notes Eftekhari. “The reason magnetars are a compelling candidate for FRBs is that we have observed similar events emanating from known magnetars within our Milky Way.”
Neutron stars already possess strong magnetic fields, but magnetars are in a category of their own, with magnetic fields thousands of times stronger than those of typical neutron stars.
Furthermore, a higher frequency of FRBs has been detected in galaxies with rapid star formation. As Eftekhari explains, “To produce a supernova that results in a magnetar, a massive star is required, and these giant stars are found in star-forming galaxies.”
So, is the case settled? Not quite.
The Canadian CHIME radio telescope detected FRB 20240209A, potentially originating from a globular cluster. – Photo Credit: CHIME Experiment
This is where the two new studies published in January 2025 come into play, both examining the recurring FRB known as 20240209A.
“The first exciting aspect of this FRB is that it originates outside our galaxy,” says Vishwangi Shah, a doctoral student at McGill University, referencing the second study.
“There is only one other FRB detected outside our galaxy. In terms of its repeaters, I believe it originates from a globular cluster.”
Both Eftekhari and Shah suggest that 20240209A is also associated with globular clusters (dense groups of ancient stars existing on the outskirts of galaxies).
“This is remarkable,” Eftekhari comments. “The notion of magnetar progenitors poses a challenge since they typically require a group of young stars to form magnetars.”
So what does this mean for FRBs? One possibility is that magnetars are still the culprits, but they may be generated through entirely different mechanisms.
For instance, within these stellar graveyards, two normal neutron stars might combine to form magnetars. Alternatively, a white dwarf—a stellar remnant too small to evolve into a neutron star—could gather material from a nearby companion, culminating in a massive explosion that results in a magnetar.
Ultimately, the exact origin of these outlier events remains unknown. “It’s thrilling to contemplate that we might be dealing with a subpopulation of FRBs,” Eftekhari remarks. “This case isn’t as clear as it appears.”
Can We Determine the Origins of FRBs?
Despite nearly two decades of research, many questions regarding FRBs linger. Which objects are responsible? What processes drive these phenomena? And why do some FRBs repeat while others do not?
Thanks to advances in FRB detection technology, answers may be nearer than anticipated.
CHIME is currently undergoing enhancements aimed at pinpointing bursts with unprecedented precision.
This advancement in FRB detection represents great progress in unraveling their mysteries. While many FRBs have been observed, accurately identifying their environments has left several key questions regarding their origins unanswered.
Jankowski believes that in the near future, many cases like 20240209A could be unlocked, revealing their underlying mechanisms. “I anticipate significant progress in the coming years,” he adds.
The Square Kilometer Array (SKA), a massive observatory spanning Australia and South Africa, aims to join the search for FRBs shortly.
Eftekhari and Shah have also proposed utilizing the James Webb Space Telescope to explore the region where 20240209A was detected.
“It’s an incredibly exciting time for FRB research,” highlights Jankowski. “We are poised to make remarkable discoveries in the next few years.”
Meet Our Experts
Dr. Tarraneh Eftekhari is a radio astronomer at Northwestern University, USA, with contributions to various scientific journals including Astrophysics Letter, Nature Astronomy, and Astrophysical Journal.
Dr. Fabian Djankowski is an astrophysicist at the French National Centre for Science and Technology who specializes in FRBs. His work has appeared in Monthly Notices of the Royal Astronomical Society, Astrophysics Letter, and Astronomy and Astrophysics.
Vishwangi Shah is a doctoral student at McGill University in the USA and a researcher focusing on radio astronomy and FRBs. She has been published in Astrophysics Letter and Astronomy Journal.
We have confirmation that a strange planet orbits between two stars
Aaron Alien/Shutterstock
Following extensive observation, scientists are on the verge of unraveling how pairs of stars engage in stable orbital dynamics surrounding elusive planets.
In 2004, David Lamb from the University of Canterbury, New Zealand, identified a puzzling repeating signal while monitoring the motion of a star pair in the Nu Octantis system. This initiated an ongoing discussion about whether planets twice the size of Jupiter exist in that system. Now, along with Ram Mann Whiley from the University of Hong Kong and his colleagues, they present strong evidence suggesting that Nu Octantis is a trio rather than a binary system.
A significant discovery was that the Nu Octantis planet is moving in reverse. The planet and one star orbit the second star in opposite directions, with the planet maintaining a close orbit around the latter. Lee observes that this is an unusual occurrence, but the system is stable. His team reached this conclusion thanks to enhanced measurement tools, like the HARPS spectrometer on the 3.6-meter telescope at the European Southern Observatory in Chile. The persistence of the planetary signal across years of observation reinforced their findings. “We’re pretty sure [the planet] is genuine. If it were related to stellar activity, it shouldn’t exhibit such consistency over years of data,” remarks Lee.
Nonetheless, this retrograde planet is not an uncommon feature of Nu Octantis. Researchers utilized a large telescope at the Southern European Observatory to determine that one of the stars is a white dwarf. Lee explains this complicates the history of Nu Octantis, as it suggests that the planet’s current orbit was impossible when it was younger, larger, and brighter.
Thus, the planet initially orbited both stars simultaneously but fundamentally changed its trajectory when one of the stars became a white dwarf, or it formed from a mass expelled when the stars transitioned to white dwarfs. Continued observations and mathematical modeling may clarify which scenario occurred, but both possibilities are novel, notes Lee.
For centuries, astronomers believed that all planets orbit the central star in the same direction, with regular intervals governing the orbital arrangement. However, Nu Octantis challenges these conventions, according to Manfred Kunz from the University of Texas at Arlington. “Scientists are urging us to broaden our understanding of star and planetary scenarios, in terms of both formation and evolution,” he states.
One in five people (an estimated 64 million people in the US) has increased levels of small particles in their blood. It can significantly increase the risk of heart attacks and strokes.
But few people knew about it and there was not much to do, so little doctors would have checked it. Dieting is useless. I don’t even exercise. There were no medicines.
But that may change in the near future.
On Sunday, the cardiologist announced that the experimental drug created by Eli Lily of Repodisilan can lower particle levels by 94% with a single injection. The effect lasted for 6 months and there were no serious side effects.
However, it has not yet been confirmed that lowering LP(a) levels reduces the risk of heart attacks and strokes. It awaits a massive clinical trial currently underway.
Lily’s research was presented on Sunday at the American Society of Cardiology’s Annual Meeting and was presented simultaneously Published New England Journal of Medicine. At least four companies are also testing innovative drugs that block the production of the body of LP(A) and the mixing of lipids and proteins.
Dr. David Maron, a preventive cardiologist at Stanford University who is not involved in Lily’s research, said evidence of a severe and long-term reduction in lipoprotein levels by repodisilans is “thrilling.”
Dr. Martha Gulati, a preventive psychologist at Cedars-Sinai Medical Center, was also not involved in the exam, saying the study was “really elegant.”
Eli Lilly is currently conducting large clinical trials asking whether the drug can prevent heart attacks, strokes or cardiovascular death. It will end in 2029. Clinical trials of other drugs targeting LP(a) end more quickly. The first is a study of Novartis drugs that are injected monthly, with results expected in 2026.
However, cardiologists warn that there is no guarantee that medicine will protect people. They remember too well the lessons they learned, assuming that changing risk factors could change risk. Cardiologists were once keen on drugs that raise HDL levels known as “good cholesterol.” People with naturally higher HDL levels had a lower incidence of heart disease. These HDL raming drugs did not help.
Dr. Daniel Rader, a preventive psychologist at the University of Pennsylvania Perelman School of Medicine, says LP(A)-lowering “is a huge new frontier in cardiovascular medicine.” Dr. Radar is a member of Novartis’ Scientific Advisory Committee and has written editorials to accompany new papers.
Treatments targeting LP(a) took a long time.
Lipoprotein was identified as a in 1974 Risk factors for heart disease This is controlled by genes rather than lifestyle or environment.
People with slightly higher than normal LP(a) levels have an approximately 25% increase in their risk of heart attacks and stroke. And very high levels can double the risk, as seen in 10% of the population.
Cardiologists say patients with no obvious reason for heart attacks or stroke (with normal cholesterol levels and blood pressure and not smoking) often know that their LP levels are high. Usually, it is found that they have a family history of heart disease of unknown cause.
The same applies to people who are experiencing heart attacks at a young age, says Dr. Stephen Nissen, a preventive psychologist at Cleveland Clinic, is an academic leader in the Lilly drug trials, and for clinical trials of three other new drugs.
“If you go to the coronary care unit and see a 40-year-old with an acute myocardial infarction, you need to know your LP(a) level,” he said, referring to a heart attack. Often they said their levels were 250 nanomoles or even higher per liter. The normal limit is 75.
Dr. Maron said his clinic is full of people who don’t know why they developed heart disease until they learn that they have high levels of LP.
One is Montewood, a 71-year-old retired firefighter who lives in Reading, California. His LDL cholesterol levels rose to moderately. His blood pressure was normal. He didn’t smoke. However, he had his first heart attack in 2006 while taking cholesterol-lowering statins.
It appeared that almost all of Mr. Kisae’s family had died of heart disease.
His paternal grandmother had her first heart attack when she was in her 40s. She died of a heart attack at the age of 63. His father and his father’s brother died of heart disease. Mr. Kisae’s brother died of a heart attack.
When Dr. Maron tested Wood’s LP level, it was above 400.
Dr. Maron and other preventive psychologists say they regularly test LP(a) levels in all patients, like Dr. Grati, Dr. Nissen and Dr. Radar. Because LP(a) levels are gene-controlled, patients should only test once.
Dr. Nissen is dull with LP(a) patients.
“We say: You have a disability that has serious meaning. I want to take all the risk factors you’ve been off the table,” he said.
But Dr. Grati said that a study found it. 0.3% The US population is receiving insurance-paid LP(a) tests, with only 3% of heart disease patients being tested.
She and other preventive cardiologists say that all adults should take the LP(a) test. If the level is high, your doctor should actively treat all other risk factors.
For Kisei, it meant taking Repatha, a powerful cholesterol-lowering drug that lowered his LDL cholesterol levels to 30.
However, Mr. Kisae’s case did not end there. Dr. Maron led one of the new drugs that lower LP(a) levels to clinical trial testing.
During the exam, Kisae had no symptoms of heart disease. I had no chest pain or shortness of breath. When the exam was finished, his symptoms returned, leading to a square bypass operation.
“It’s anecdotal,” Dr. Maron said. “But these drugs can prevent heart attacks.”
Entomologists describe a new species of the Tiger swallow (genus genus) Papirio) From eastern North America.
Papilio Sorstian: (a) male, holotype and (b) female, arotype. Scale bar – 10 mm. Image credit: Derotler et al. , doi: 10.3897/zookeys.1228.142202.
Papirio It is a large genus of swallowtail butterflies within the family Papillonidae.
The only representative of the Papillionini family, the genus contains about 200 scientifically recognized species.
Newly identified members of the genus Papilio Sorstianbelongs to North America Papilio Glaucus Species group.
” Papilio Glaucus The group is a model research system for insect evolutionary biology. ” Dr. B. Christian Schmidt Arknides, nematodes and colleagues wrote on paper from the Canadian National Insect Collection.
“Recognition and boundaries” Papilio Glaucus and Papilio canadensis Three decades of study in speciation, host plant adaptation, hybridization, and molecular evolution have been conducted as a pair of classical sibling species. ”
“Recently, we have discovered a third species. Papilio appalachiansisprovided unprecedented insights into speciation by hybridization. ”
” Papilio Glaucus The group is primarily part of the clades of the subgenos of the New World clades on a large scale Pterourussometimes recognized as a distinct genus,” they added.
“The various within the group demonstrate adaptation to a variety of thermal niches that are warmly characterized (Papilio Glaucus), intermediate (Papilio appalachiansis), and cool (Papilio canadensis) Climate region; all have a wide larval host plant diet and are not limited by its distribution. ”
Papilio Sorstian It is closely related to these three species, but unlike all of the series of characters.
“The most important differences are evident in developmental biology and biology,” the researchers wrote.
“Papilio Sorstian Compared to May for all other species, it is unique during long delays in appearance after adult escape, starting from late June to early July to late June to early July. ”
Papilio Sorstian'The geographical range is Papilio Glaucus The southern end of Papilio canadensis.
“Core Range Papilio Sorstian It includes eastern and south-central Ontario, northern and central New York, and adjacent Vermont, New Hampshire and Pennsylvania.2The scientist wrote in his paper.
“In New York Papilio Sorstian He lives in most of the states except the Southeast and New York City metropolitan areas. ”
“In Canada, Papilio Sorstian It extends westward from Montreal, Quebec, to the Bruce Peninsula in Ontario and south to the Niagara region. ”
“The western limits seem to be on the east coast of Lake Huron. We haven’t seen any verifiable specimens of the west there.”
“Current evidence is consistent with the possibility Papilio Sorstian There is a recombinant evolutionary origin of Papilio appalachiansisThey added.
“However, the evolutionary origin of this kind, Papilio Glaucus-complex, I still can’t answer. ”
“Recognizing and defining the taxonomic identity of this unique evolutionary lineage is our hope to provide a staging point on the fertile grounds for future research.”
CJ Derotler et al. 2025. A mysterious new species of the tiger swallow (Capidae, Papillonidae) in eastern North America. Zookeys 1228:69-97; doi:10.3897/zookeys.1228.142202
Being a physicist, I have a deep appreciation for all small particles. Each particle plays a crucial role in the universe, and by studying them, we gain a better understanding of the fundamental laws of nature that govern our existence. However, as a researcher in the field of Dark Matter, I must confess that Neutrinos present a unique challenge.
Neutrinos are elusive little particles. From their inception, they defied all expectations.
Confronted with this dilemma, physicists had two unsatisfactory options: either abandon the conservation of energy or posit the existence of invisible particles that could not be detected by conventional means. They opted for the latter, eventually coining the term “Little Neutral” for these new particles, which possessed no charge and were abundant in quantity.
The absence of charge was the defining feature – without charge, the particles do not interact at all through electromagnetic force. This led physicist Wolfgang Pauli to famously remark, “I have done a terrible thing. I have postulated a particle that cannot be detected.”
Fortunately, Pauli’s skepticism about detectability was proven wrong in the end. Neutrinos, though notoriously resistant to interactions with other particles, do pass through our planet on a daily basis without our notice. It took a truly heroic effort to develop instruments capable of detecting them.
Even now, we are still struggling to capture neutrinos. The standard detection method involves constructing large water tanks deep underground or filled with other liquids (to shield them from cosmic rays). Each day, researchers anxiously wait for one of the four neutrinos that pass through the Earth to directly collide with an atom underwater.
If such a collision occurs, a flash of light is produced as the charged particles in the water move quickly. This light flash acts like an electromagnetic version of the Sonic boom, encoding information about neutrinos and providing insights into these invisible particles that constantly permeate the Earth.
Read more:
Most of the neutrinos detected on Earth come from the solar nucleus. When hydrogen fuses with helium, neutrinos are produced as by-products. They emanate in all directions as soon as they are generated, mostly unaffected by the sun’s mass, and escape into space.
The reason neutrinos pose a specific challenge to dark matter detectors is their similarity to the hypothetical dark matter particles we seek known as Weakly Interacting Massive Particles (WIMPs). Like neutrinos, these “weakly interacting massive particles” have no charge and can traverse the Earth unnoticed.
If they do interact with other matter, it is through weak nuclear force – the same force that may (albeit rarely) cause neutrinos to interact with the underwater particles in the neutrinoscope. Similar to neutrino detectors, dark matter detectors are situated deep underground to shield them from cosmic rays, designed to register any interactions occurring within the detector with these invisible particles.
The challenge arises from the fact that the dark matter detector has become incredibly sensitive, picking up signals caused by neutrinos. Both types of detectors have now produced evidence of solar neutrinos colliding with target materials. The amount of rock cover cannot adequately shield experiments from neutrinos.
Our estimated 27% of the universe consists of dark matter – Photo Credit: Getty
It may take several decades for a dark matter signal detector unaffected by solar neutrino interference to achieve total clarity. Currently, most detectors are only sensitive to high-energy solar neutrinos, which have been causing complications thus far.
Some physicists are intrigued by the phenomenon of “coherent neutrino scattering” and see it as an opportunity to overcome the challenges of both dark matter detection and neutrino interference. Ultimately, dark matter may be composed of an entirely different substance.
Nevertheless, if dark matter does indeed comprise WIMPs, we will need to think outside the box in our experiments. For those of us delving into the mysteries of the universe’s dark side, the seemingly bright future of neutrinos may blind us to the realities of dark matter.
The melodious high-pitched sound of birdsong is not something typically associated with the vastness of space, usually serving as a delightful indication of the arrival of spring. However, to the surprise of many, scientists at China’s Beijing Aviation University have recently stumbled upon a similar occurrence over 100,000 kilometers away from Earth.
Through the analysis of data collected from NASA’s Magnetospheric Multiscale (MMS) satellite, researchers have pinpointed a phenomenon referred to as “chorus waves,” which consist of bursts of electromagnetic radiation traveling along Earth’s magnetic field lines.
If one were to venture into space, this sound would remain unheard due to the absence of air for sound waves to propagate. Interestingly, upon conversion into an audio signal for examination, this “chirp” is actually the auditory representation of these waves.
So, what exactly causes these electromagnetic chirps? Contrary to expectations, it is not a celestial songbird. In reality, chorus waveforms are relatively common. However, the peculiarity lies in their location, as highlighted by their distance from Earth.
The energy transfer induced by chorus waves prompts electron acceleration to speeds nearing that of light, crucial for the formation of Earth’s radiation belts which shield against the sun’s energetic particles.
While these accelerated particles contribute to the magnificent aurora borealis, they are also dubbed “killer electrons” due to the hazards they pose to satellites, astronauts, and crucial communication systems.
Typically, these waves are found around 51,000 km (32,000 miles) away, in a region influenced by the “magnetic dipole effect,” defining the Earth’s magnetic field with north and south poles.
However, a 2016 study published in nature unveiled that for the first time, these chorus waves have been observed at distances up to 165,000 km (103,000 miles) from Earth, in regions where the magnetic field is distorted and dipole effects are absent.
Furthermore, these waves exhibit similar properties to those closer to Earth, lasting around 0.1 seconds with frequencies reaching nearly 100Hz (akin to the noise of a revving car engine).
Chorus waves are part of the complex magnetic field system that causes auroras – Photo credit: Getty
Why is this discovery significant? It indicates that Earth’s environmental conditions are not prerequisites for wave generation as previously assumed by scientists.
“Though this finding does not refute existing theories… it certainly prompts a deeper investigation,” remarked Professor Richard Horne, head of space weather at the British Antarctic Survey, not involved in the study.
“The unexpected presence of chorus waves in this region calls for further exploration in areas where the Earth’s magnetic field displays substantial deviations from the dipole.”
Chorus waves play a vital role in shielding Earth from solar storms, yet they also pose potential dangers. Enhanced understanding of these waves can lead to better protective measures.
Horne expressed that this breakthrough “will significantly enhance our comprehension of these waves and refine our capacity to forecast them.”
Fog consists of water vapor molecules that float as tiny water droplets in the air but remain near the ground. Essentially, fog is a cloud touching the Earth’s surface, forming similar to clouds. High humidity plays a significant role in fog formation, and depending on its rate and temperature, fog can appear and vanish suddenly.
Water in its vapor state is transparent and invisible. The higher the air’s temperature, the greater its kinetic energy, allowing more water molecules to exist as vapor.
When warm, moisture-rich air cools abruptly, the water molecules slow down too much to maintain their vapor form and combine into small liquid droplets. These droplets, while still small enough to float in air currents, appear opaque as light reflects off the air-water interface.
Radiation fog forms on the ground during calm, clear nights when heat absorbed by the Earth’s surface during the day radiates into the air. As the heat rises, the air near the surface cools until it becomes saturated.
Cold air holds less water vapor than warm air, causing the water vapor to condense into fog. Radiation fog typically dissipates as the ground warms up again, but it can persist all day in the winter.
Radiation fog is also known as shallow fog or ground fog when it occurs in a narrow layer below average eye level on land and below about 10 meters at sea.
Valley fog develops at the bottom of valleys as cold, dense air settles and condenses to form fog. It is restricted to local terrains like hills and mountains and can persist for several days.
Advection fog forms when horizontal winds push warm, moist air onto cold surfaces, leading to fog formation through condensation. This phenomenon is common at sea, where warm tropical air interacts with cold water. Advection fog can cover large areas, with the Golden Gate Bridge in San Francisco Bay often obscured by it.
Sea fog, a type of advective fog, occurs when warm, moist air descends from land into chilly oceans, or when warm fronts clash with cold ocean currents. The northeast coast of the UK is particularly prone to sea fog due to the cold waters of the North Sea.
Uphill fog, a type of hill fog, occurs when moist air is pushed up a slope, hill, or mountain by wind, cooling and condensing to form fog as it descends down the slope.
Evaporative fog is akin to advection fog, forming when cold air passes over moist land or warm water. When warm water evaporates into the lower atmosphere, it warms the air, causing it to rise. This upward movement of warm, moist air mixes with cooler air until reaching 100% humidity, resulting in fog formation. Evaporative fog is commonly observed at lakes, ponds, and outdoor pools.
Why does altitude affect temperature?
Consider the atmosphere as consisting of air masses. The higher an air parcel, the less compressed it is due to the weight of the atmosphere above, allowing for greater volume. This expansion requires energy, leading to sacrifice of thermal energy and a decrease in temperature.
Does sound travel further on foggy days?
“Sound propagates through the air as pressure waves move air molecules back and forth. In fog, water droplets scatter more sound energy, attenuating the sound and reducing the distance it can travel,” explains physicist Robert Matthews.
However, the complete impact of fog formation conditions on sound travel is not fully resolved. “On warm, highly humid days, smaller droplets have minimal effect on sound waves,” he adds.
“Moist air, being denser than dry air, allows sound waves to travel more effectively and be heard over greater distances,” Matthews further explains.
After completing his physics studies at Oxford, Robert ventured into science writing. He currently serves as a visiting professor of science at Aston University.
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Submitted by: Rich French, London
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In 2018, astronomers discovered that the corona of 1ES 1927+654, an actively accreting black hole with 1.4 million solar masses located in a galaxy some 270 million light-years away, suddenly disappeared and reassembled several months later. I observed that. The short but dramatic outage was the first of its kind in black hole astronomy. Now, astronomers using ESA's XMM-Newton Observatory have captured the same black hole exhibiting even more unprecedented behavior. They detected X-ray flashes from 1ES 1927+654 at a steadily increasing clip. Over a two-year period, the frequency of millihertz vibration flashes increased from every 18 minutes to every 7 minutes. This dramatic speed-up of X-rays has never been observed from a black hole before.
In this artist's concept, material is stripped from a white dwarf (bottom right sphere) orbiting within the innermost accretion disk surrounding the supermassive black hole of 1ES 1927+654. Image credit: NASA/Aurore Simonnet, Sonoma State University.
Black holes are a prediction of Albert Einstein's theory of general relativity. They are gravitational monsters that trap any matter or energy that crosses their “surface,” a region of spacetime known as the event horizon.
In its final descent into the black hole, a process known as accretion, the doomed material forms a disk around the black hole. The gas in the accretion disk heats up and emits primarily ultraviolet (UV) light.
The ultraviolet light interacts with the cloud of electrically charged gas or plasma that surrounds the black hole and accretion disk. This cloud is known as the corona, and the interaction energizes the ultraviolet light and amplifies it into X-rays, which can be captured by XMM Newton.
XMM-Newton has been observing 1ES 1927+654 since 2011. Back then, everything was very normal.
But things changed in 2018. As the X-ray corona disappeared, the black hole erupted in a massive explosion that seemed to disrupt its surroundings.
The coronavirus gradually returned, and by early 2021, it seemed like normal conditions had returned.
However, in July 2022, XMM Newton began observing its X-ray output fluctuating at a level of about 10% on timescales of 400 to 1,000 seconds.
This type of fluctuation, called quasi-periodic oscillations (QPO), is notoriously difficult to detect in supermassive black holes.
“This was the first sign that something strange was going on,” said Dr. Megan Masterson. Student at MIT.
The oscillations could suggest that a massive object, such as a star, is embedded in the accretion disk and rapidly orbiting the black hole on its way to being swallowed.
As an object approaches a black hole, the time it takes to orbit decreases and the frequency of its oscillations increases.
Calculations revealed that the orbiting object was probably the remains of a star known as a white dwarf, had about 0.1 times the mass of the Sun, and was moving at an astonishing speed.
It was completing one orbit of the central monster, covering a distance of about 100 million km, about every 18 minutes. Then things got even weirder.
Over nearly two years, XMM Newton showed an increase in the strength and frequency of the vibrations, but not as much as the researchers expected.
They assumed that an object's orbital energy is being emitted as gravitational waves, as prescribed by the theory of general relativity.
To test this idea, they calculated when the object crossed the event horizon, disappeared from view, and stopped oscillating. It turns out to be January 4, 2024.
“Never in my career have I been able to predict anything so accurately,” says Dr. Erin Kara of MIT.
In March 2024, XMM Newton observed it again and the oscillations were still present.
The object was currently traveling at about half the speed of light, completing an orbit every seven minutes.
Whatever was inside the accretion disk, it stubbornly refused to be swallowed up by the black hole.
Either something more than gravitational waves is at play, or the entire hypothesis needs to be changed.
Astronomers also considered other possibilities for the origin of the vibrations.
Remembering that the X-ray corona disappeared in 2018, they wondered if this cloud itself was vibrating.
The problem is that there is no established theory to explain such behavior, so there is no clear path to take this idea further, so they go back to the original model and realize there is a way to fix it. I did.
“If the black hole has a white dwarf companion, the gravitational waves produced by the black hole could be detected by LISA, an ESA mission scheduled to launch within the next 10 years in partnership with NASA.” said Masterson.
Mars is at the extreme of salt water stability. And only the combination of the most favorable environmental conditions and the salt with the lowest eutectic temperature could stabilize brine, at least temporarily, on the surface of Mars, one researcher says. new research Published in Proceedings of the National Academy of Sciences.
This image of an impact crater in the Sirenum Fossai region of Mars was taken by NASA's Mars Reconnaissance rover on March 30, 2015. The crater is approximately 3,300 feet (1 km) wide and appears to be relatively recent due to its sharp edges and wells. -Stored emissions. The steep inner slopes are carved by canyons and contain slope lines that may recur on the equator-facing slopes. Image credit: NASA / JPL / University of Arizona / Alfred McEwen.
Liquid water is an important prerequisite for a habitable planet. However, the combination of Mars' low temperatures, atmospheric pressure, and water vapor pressure means that any liquid water found on Mars would likely freeze, boil, or evaporate quickly, making it unlikely that Mars exists. .
However, paleontologists continue to insist that liquid water exists on Mars.
Of particular interest is the discovery of seasonal black stripes called repeat slope lines.
These features appear in some places on Mars when temperatures rise above -23 degrees Celsius (-10 degrees Fahrenheit) and disappear when it gets colder.
They are often described as possibly being associated with liquid water.
The new study puts a damper on the idea that liquid water is likely to be found soon in Mars' recurring slopes, permafrost, or salt water.
“If we look closely at RSL, its behavior is consistent with a sand or dust flow, and water is not required for RSL formation,” said lead author Dr. Vincent Chevrier, a researcher at the University of Arkansas. said.
Other researchers believe that brine, a highly salty solution like Earth's oceans, may hold the key to finding liquid water on Mars.
Salt water can freeze at much lower temperatures, and Mars is rich in salt.
Among these salts, perchlorate appears to be the most promising because of its extremely low eutectic temperature (the temperature at which the melting point of the mixture is lower than that of the single components).
For example, calcium perchlorate brine freezes at -75 degrees Celsius (-14 degrees Fahrenheit), but the average surface temperature near the equator of Mars is -50 degrees Celsius (-58 degrees Fahrenheit), so theoretically This suggests that there may be zones where calcium coagulates. Perchlorate water can remain liquid, especially underground.
Dr. Chevrier and his colleague, Dr. Rachel Srank of the Lunar and Planetary Institute, then considered all the arguments for and against brine that could form a stable liquid.
“A variety of limiting factors, including the relatively small amount of most promising salts, water vapor pressure, and ice position, strongly limit the amount of brine present at the surface and in the shallow subsurface,” the researchers said. Ta.
“And even if saline waters formed, they would still remain uninhabitable by terrestrial standards.”
“Despite these drawbacks and limitations, there is always a possibility that Martian life adapted to these salt waters and some terrestrial life could survive in them. This is a planetary protection consideration because there is a possibility that
“Therefore, detecting brine in situ remains a key objective for Mars exploration.”
The next hurdles ahead, the authors say, are improving the equipment needed to detect small amounts of brine, better identifying the best places to look for brine, and conducting more experiments under Martian conditions. It is suggested that this is to enable room measurements to be carried out.
“Despite our best efforts to prove otherwise, Mars remains a cold, dry, and completely uninhabitable desert,” Chevrier said.
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Vincent F. Chevrier and Rachel A. Slank. 2024. The elusive nature of liquid brine on Mars. PNAS 121 (52): e2321067121;doi: 10.1073/pnas.2321067121
A mysterious illness with flu-like symptoms has claimed the lives of dozens of people in the Democratic Republic of Congo, as reported by the country’s health authorities.
As of Tuesday, the unknown disease has resulted in the death of 79 people and the sickness of 376 individuals, according to the country’s Ministry of Public Health, Hygiene and Social Security.
In a statement regarding X, the ministry stated that the origin of the disease is “still unknown” and was first identified in Kwango province in southwestern Congo.
Symptoms reported include fever, headache, stuffy nose, cough, difficulty breathing, and anemia.
According to Reuters and Associated Press, local authorities have warned that the death toll could potentially rise to 143.
The Ministry of Health emphasized that the remains of those who have died with similar symptoms should not be handled without the involvement of authorized health authorities. They urged the public to report any suspicious illnesses or unusual deaths, avoid large gatherings, and follow basic hygiene practices like washing hands with soap and water.
Emergency public health officials are being deployed to the affected area, as confirmed by the ministry.
The World Health Organization, in response to the reports of the unidentified illness, stated to NBC News that they are collaborating with local authorities and have dispatched a team to collect samples for laboratory testing.
The U.S. Centers for Disease Control and Prevention, with offices in Congo, is aware of the situation and is providing technical support to a rapid response team sent by the local emergency operations center.
NASA has released a surprising image of the unusual edge-on spiral galaxy UGC 10043 taken by the Hubble Space Telescope.
This Hubble image shows UGC 10043, an unusual spiral galaxy located about 150 million light-years away in the constellation Serpens. Image credits: NASA / ESA / Hubble / R. Windhorst / W. Kiel.
UGC 10043 It is located in the constellation Serpens, about 150 million light years from Earth.
Also known as IRAS 15464+2201 or LEDA 56094, this galaxy is one of the somewhat rarer spiral galaxies. Viewed from the side.
“We see galactic disks as sharp lines through space, with pronounced dust lanes along them,” Hubble astronomers said in a statement.
“This dust is spread throughout UGC 10043's spiral arm, but when viewed from the side it appears very thick and cloudy.”
“Surprisingly, we can also see that the center of the galaxy has a bright, almost egg-shaped bulge that towers far above and below the disk.”
“All spiral galaxies have such a bulge as part of their structure, containing stars that orbit the center of the galaxy in paths above and below the spiral disk.”
“This is a feature that isn't usually obvious in pictures of galaxies.”
“The unusually large size of this bulge compared to the galaxy's disk is likely due to UGC 10043 sucking up material from nearby dwarf galaxies.”
“This may also be why the disc warps, causing one end to bend up and the other end to bend down.”
Two filters were used to sample different wavelengths.
Color is obtained by assigning different hues to each monochromatic image associated with an individual filter.
“Like most full-color images published by Hubble, this image is a composite of multiple individual snapshots taken by Hubble at different times and capturing different wavelengths of light,” the astronomers said. Explained.
“What is remarkable about this image is that the two sets of Hubble data used were collected 23 years apart, in 2000 and 2023.”
“Hubble's longer lifespan not only allows us to generate new and better images of old targets.”
“It also provides a long-term archive of data, making it increasingly useful to astronomers.”
Astronomers using the NASA/ESA/CSA James Webb Space Telescope have determined that within the first billion years after the Big Bang, three supermassive galaxies with a mass roughly the same as our own Milky Way already existed. I discovered that there is. The discovery, part of the JWST/FRESCO survey, shows that stars in the early universe grew much more rapidly than previously thought, casting doubt on existing models of galaxy formation.
Three red monster galaxies discovered by Webb. Image credits: NASA / CSA / ESA / M. Xiao & PA Oesch, University of Geneva / G. Brammer, Niels Bohr Institute / Dawn JWST Archive.
Until now, it was thought that all galaxies formed gradually within large halos of dark matter.
Dark matter halos trap gas (atoms and molecules) in gravitationally bound structures.
Typically, up to 20% of this gas is converted into stars within a galaxy.
But new discoveries cast doubt on this view, revealing that giant galaxies in the early universe may have grown much more rapidly and efficiently than previously thought.
“The problem of ‘impossible’ giant galaxies in the aftermath of the Big Bang has puzzled astronomers since the first images of the web,” said Dr Ivo Rabe, an astronomer at Swinburne University of Technology.
“This is like finding a 100 kg infant. Webb has proven that monsters roam the early universe.”
While most of the sources found in the FRESCO survey fit existing models, astronomers also discovered three surprisingly massive galaxies with stellar masses comparable to today’s Milky Way galaxy. .
They are named “red monsters” because of their high dust content and their distinctive red color in web images.
These form stars nearly twice as efficiently as their subsequent lower-mass counterparts and galaxies.
“These findings raise new questions about galaxy formation theory, especially the problem of ‘too many, too big’ galaxies in the early Universe,” said Dr. Rabe.
“Current models cannot explain why star formation occurs so efficiently so early in the universe.”
“The general assumption is that an exploding star or a supermassive black hole kills star formation and blows out the candle.”
“I have no doubt that future observations of the web will provide clues about what we are missing.”
Professor Stein Weitz, an astronomer at the University of Bath, said: “Finding three such gigantic beasts among the specimens poses an interesting puzzle.”
“Many processes of galactic evolution tend to introduce rate-limiting steps in how efficiently gas turns into stars, but somehow this red monster quickly bypassed most of these hurdles. It seems there is.”
“These results show that galaxies in the early Universe may form stars with unexpected efficiency,” said Dr. Mengyuan Xiao, an astronomer at the University of Geneva.
“Studying these galaxies in more detail will provide new insights into the conditions that shaped the early days of the universe.”
“The Red Monster is just the beginning of a new era in the exploration of the early universe.”
“That’s the great thing about astronomy: we’re always surprised by new discoveries,” Professor Weitz said.
“Already in the first few years, Webb has thrown us some curveballs.”
“In multiple ways, we show that some galaxies mature rapidly during the first chapters of the universe’s history.”
a paper Survey results are published in a magazine nature.
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M. Xiao others. The formation of supermassive galaxies accelerates during the first billion years. naturepublished online on November 13, 2024. doi: 10.1038/s41586-024-08094-5
Trillions of neutrinos pass through our bodies every second. The sun produces them through nuclear fusion. The same goes for nuclear power plants. Some come from supernova explosions in space. Neutrinos are paired with antineutrinos, which scientists believe mirror the behavior of neutrinos.
As such, JUNO is designed to capture antineutrinos, specifically the antineutrinos emitted by two nuclear power plants located approximately 53 miles from the observatory.
The 13-story JUNO sphere will be filled with a special liquid called a scintillator and submerged in a cylinder of purified water, said project leader Wang Yifang, director of the China Institute of High Energy Physics.
When the antineutrinos pass through the liquid, they trigger a chemical process that produces a brief burst of light that can be picked up by sensors inside the sphere.
“This event will cause a flash that will last only about 5 nanoseconds, and we hope to capture it with thousands of photomultiplier tubes surrounding the sphere,” he says, as a worker behind him says, Mr. Wang, wearing a helmet, spoke while installing the doubler. “We hope to catch 60 events per day.”
Thanks to its approach, JUNO should be able to measure differences in antineutrino masses about 10 times more accurately than previous instruments.
First of three new neutrino observatories
JUNO is part of China’s ambitious efforts to become a global scientific powerhouse. In a speech this year, President Xi Jinping laid out plans to transform the country into a science and technology superpower by 2035.
October 11th, workers at the bottom of JUNO.Eric Baclinao/NBC News
JUNO is expected to be the first of three next-generation neutrino observatories to open over the next decade, making it a kind of spearhead in a new era of physics. In Japan, the Hyper-Kamiokande Observatory is scheduled to open in 2027. And a U.S.-backed program called the Deep Neutrino Experiment (DUNE) calls for particle accelerators to send beams of neutrinos underground from Illinois to North Dakota starting in 2027. 2031.
The three upcoming observatories are both complementary and competitors, as they all plan to use different techniques to detect particles. Each project involves extensive international collaboration aimed at advancing the field, creating new spin-off technologies and training a new wave of scientists.
“When you start these experiments, it’s not unlikely that you’ll observe something unexpected,” said Chris Marshall, an assistant professor of physics at the University of Rochester who works on the DUNE project. “Trying to unravel these very complex effects will require multiple experiments measuring things in different ways.”
The ability of each observatory to answer important physics questions depends in part on how well researchers can collaborate between and among projects. But there is growing concern among some scientists around the world that rising geopolitical tensions between the United States and China, and the resulting deterioration in their scientific relations, could hinder progress. are.
In recent years, the United States has pursued policies to prevent Chinese scientists from bringing American-based technology to the country and to prevent China from poaching its scientific stars.
Wang said the U.S. is denying visa applications for 2022 and 2023 without explanation and limiting U.S. involvement in JUNO.
“In science, cooperation and competition are good, but it can’t be all about competition,” he said.
On October 11, Mr. Wang pointed out to journalists the underlying characteristics of JUNO’s domain.Eric Baclinao/NBC News
U.S.-based scientists also said they have found new obstacles to cooperation with Chinese scientists.
“From the U.S. side, it’s becoming increasingly difficult to obtain funding for collaborations with Chinese colleagues,” Patrick Huber, director of the Center for Neutrino Physics at Virginia Tech, said in an email. It has also become much more difficult for our Chinese colleagues to obtain U.S. visas.” .
“It’s not impossible to collaborate with Chinese scientists, but it’s becoming increasingly difficult,” said Ignacio Taboada, a physics professor at the Georgia Institute of Technology who directs an existing neutrino observatory in Antarctica. “I’m working on it,” he said.
Solving the mystery of neutrinos
The data generated by JUNO could go a long way toward solving important mysteries about how and why neutrinos change shape more than other elementary particles.
Neutrinos can oscillate, or transform, between three so-called “flavors” during their travels: muon, tau, and electron. For example, the sun sends electron neutrinos toward Earth, but they can also arrive as muon neutrinos. When neutrinos interact (which rarely happens), they settle on a particular flavor.
Additionally, scientists believe that neutrinos travel as one of three different mass states, and that state helps determine the likelihood of a neutrino interacting as a particular flavor. However, it is not yet clear which state has the largest population.
Scientists also found that neutrinos and antineutrinos may deform differently as they travel, and that those differences may account for some of the imbalance in the physics between matter and antimatter in the universe. I think there is.
Journalists take photos at the top of JUNO’s sphere on October 11th.Eric Baclinao/NBC News
If so, learning more about the masses and oscillations of neutrinos and antineutrinos will help researchers find a missing page in the Standard Model of physics (the rulebook of particles and their interactions), or something that has never been known before. This could help researchers understand whether missing particles or forces are having invisible effects. role.
“Our beautiful theory of reality, the Standard Model, is not the final theory,” said Sergio Bertolucci, an Italian particle physicist and DUNE co-spokesperson. “It turns out that we need to know more about neutrinos to answer things that the standard model can’t answer.”
Wang hopes JUNO will win the race to determine the neutrino mass hierarchy before the United States and other countries.
“We just want to be good scientists. In science, being first is most important. There’s nothing to be second,” he said. “As a scientist, I can’t always be a follower. I want to have my own thing.”
Entrance to the Jiangmen Underground Neutrino Observatory in China.Eric Baclinao/NBC News
If JUNO explains the neutrino mass story before DUNE comes online, the U.S.-led project will be able to measure that question differently and confirm JUNO’s results.
DUNE’s plan is to measure neutrinos as they leave the Illinois facility, then travel 800 miles around Earth, where they can interact and oscillate. If the neutrinos arrive in South Dakota and can be detected, scientists could compare the flavor combinations of the neutrinos at the beginning and end of their journey. However, the project experienced delays and cost overruns.
“JUNO’s uniquely rich dataset, alone or in combination with other experiments, will play a key role in determining bulk orders by 2030,” said Professor Pedro Ochoa said in physics and astronomy from the University of California, Irvine.
However, several scientists involved in neutrino observation projects acknowledged that it is impossible to predict how much benefit the research will actually bring to Earth. They suggested that in the future, new technologies could be spun off, driving innovation in data-intensive computing and advancing particle accelerator science.
“We can’t make electric light by improving candles, so we need to take a step forward. We need a break,” said John C., a particle physicist at the U.S. Department of Energy’s Brookhaven National Laboratory and co-spokesperson for the DUNE project. Mary Bishai says. “Basic research inherently creates discontinuities.”
Wang put it another way, saying his work is driven by pure curiosity: “I work in ‘useless’ science.”
Seven billion years ago, the universe’s star formation boom began to slow. What did our Milky Way galaxy look like at that time? Astronomers using the NASA/ESA/CSA James Webb Space Telescope have discovered a clue in the form of a cosmic question mark, the result of an unusual alignment in space spanning several light-years.
Galaxy cluster MACS-J0417.5-1154 is so massive that it warps the fabric of space-time and distorts the appearance of galaxies behind it. This phenomenon is known as gravitational lensing. This natural phenomenon magnifies distant galaxies, sometimes causing them to appear multiple times in the image, as Webb saw here. Two distant interacting galaxies (a spiral galaxy seen face-on and a dusty red galaxy seen edge-on) appear multiple times, tracing a familiar shape across the sky. Active star formation and the remarkably perfect spiral shape of the galaxy seen face-on indicate that these galaxies are just beginning to interact. Image credit: NASA/ESA/CSA/STScI/V. Estrada-Carpenter, Saint Mary’s University.
“There are only three or four known examples of similar gravitational lensing configurations in the observable universe, so this discovery is exciting as it demonstrates the power of Webb and suggests that we may find more like it in the future,” said Dr Guillaume Despres, from St Mary’s University.
The region has previously been observed by the NASA/ESA Hubble Space Telescope, but Webb was the first to spot the dusty red galaxy forming an intriguing question mark shape.
This is because the wavelengths of light that Hubble detects are trapped in space dust, while longer wavelengths of infrared light pass through Webb’s instruments and can be detected.
Astronomers used both telescopes to observe the galaxy cluster. MACS-J0417.5-1154The cluster is so large that it distorts the fabric of space-time, acting like a magnifying glass.
This will allow astronomers to see clearer details of the much more distant galaxies behind the cluster.
But the same gravitational effects that expand galaxies also cause distortions, which can result in galaxies appearing spread out in an arc across the sky, or appearing multiple times.
This optical illusion in space is called gravitational lensing.
The red galaxy Webb uncovered, along with the spiral galaxy it interacts with, previously detected by Hubble, is magnified and distorted in an unusual way that requires a special and rare alignment between the distant galaxy, the lens, and the observer — something astronomers call hyperbolic umbilical gravitational lensing.
This explains five images of the galaxy pair seen in the Webb image, four of which trace the top of the question mark.
The question mark points are, from our perspective, unrelated galaxies that happen to be in the right place and spacetime.
In addition to developing a case study for Webb, Niris Noting the ability of their infrared imaging device and slitless spectrometer to detect star formation locations in galaxies billions of light years away, the research team also couldn’t help but notice the shape of the question mark.
“This is really cool. I got interested in astronomy when I was younger because I saw amazing images like this,” said Dr Marcin Sawicki, also from Saint Mary’s University.
“Knowing when, where and how star formation occurs in galaxies is crucial to understanding how galaxies have evolved throughout the history of the universe,” said Dr Vicente Estrada Carpenter from Saint Mary’s University.
“The results show that star formation is widespread in both. The spectral data also confirm that the newly discovered dusty galaxy is located at the same distance as the frontal spiral galaxy, suggesting that the two are probably starting to interact.”
“Both galaxies in the question mark pair show several dense regions of active star formation, likely the result of the gas in the two galaxies colliding.”
“But neither galaxy seems particularly disturbed, so perhaps we are seeing the beginning of an interaction.”
“These galaxies, seen billions of years ago when star formation was at its peak, are similar in mass to the Milky Way at that time,” Dr Sawicki said.
“Thanks to Webb, we can now study what our galaxy was like in its teenage years.”
Team paper Published in Monthly Bulletin of the Royal Astronomical Society.
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Vicente Estrada Carpenter others2024. CANUCS JWST/NIRISS We will use grism spectroscopy to investigate when, where and how star formation occurs in a pair of galaxies at cosmic noon. MNRAS 532 (1): 577-591; doi: 10.1093/mnras/stae1368
This article is based on a press release provided by NASA.
The so-called i-motif is a knot-like DNA structure that forms in the nuclei of human cells and is thought to provide important genome control. Garvan Institute of Medical Research Other studies have used immunoprecipitation and next-generation sequencing to identify i-motif structures in human DNA.
Peña Martinez othersIn total, we observed 53,000 i-motifs across three human cell lines (MCF7, U2OS, and HEK293T). Image courtesy of Peña Martínez. others., doi: 10.1038/s44318-024-00210-5.
The I motif is a DNA structure that differs from the iconic double helix shape.
These form when runs of cytosine letters on the same DNA strand pair up with each other to form a four-stranded twisted structure that juts out from the double helix.
In 2018, scientists at the Garvan Institute of Medical Research were the first to successfully directly visualize i-motifs inside living human cells, using new antibody tools they developed to recognise and bind to the i-motifs.
The new study expands on these findings by using the antibody to identify the location of i-motifs throughout the genome.
“In this study, we have mapped more than 50,000 i-motif sites in the human genome that are found in all three cell types we looked at,” said Professor Daniel Crist from the Garvan Institute of Medical Research, lead author of the study.
“This is a surprisingly high number for a DNA structure whose presence in cells was once a matter of debate.”
“Our findings confirm that the i-motif is not just an object of laboratory study, but is widespread and likely plays an important role in genome function.”
The researchers found that i-motifs are not scattered randomly, but are concentrated in important functional regions of the genome, including those that control gene activity.
“We found that the i-motif is associated with genes that are highly active at specific times in the cell cycle,” said lead author Cristian David Peña Martinez, PhD, also of the Garvan Medical Institute.
“This suggests that it plays a dynamic role in regulating gene activity.”
“We also discovered that i-motifs are formed in the promoter regions of cancer genes. For example, MYC Oncogenes encode one of cancer’s most notoriously ‘untreatable’ targets.”
“This opens up exciting opportunities to target disease-related genes through i-motif structures.”
“The widespread presence of the i-motif near these 'holy grail' sequences implicated in hard-to-treat cancers opens up new possibilities for novel diagnostic and therapeutic approaches,” said study co-author Sarah Kummerfeld, PhD, a researcher at the Garvan Medical Institute.
“It may be possible to design drugs that target the i-motif to affect gene expression, potentially expanding current treatment options.”
Christian David Peña Martinez othersi-motif structures are widely distributed in human genomic DNA. Embo JPublished online August 29, 2024, doi: 10.1038/s44318-024-00210-5
Eric S. Neitzel Fireground Communications LLC/AdobeStock
Central Park Reservoir is one of the few places in New York City to get a good view of the clouds. Looking north from the reservoir’s edge, there’s a large gap between the buildings that lets you see the clouds rolling in from the harbor. Meteorologist Kara Lamb suggested we try our hand at cloud watching here.
At the time, the sky is full of fluffy cumulus clouds beneath a ceiling of altostratus. One of them looks a lot like a whale. But Lam, who studies clouds at Columbia University in New York, doesn’t think they’re so strange. “Clouds are fascinating because they’re cool to look at,” he says. “But I think about clouds in terms of climate” – understanding how the sunlight they reflect and the heat they trap beneath them affect the Earth’s temperature.
What the casual cloud watcher might not know is that clouds are the biggest unknown in predicting future climate change to determine how this balance will change in a warming world. If we double carbon dioxide from pre-industrial levels, will the world get a manageable 1.5°C warming or a hellish 4.5°C warming? The biggest source of this uncertainty is our lack of understanding of clouds.
But researchers are making progress. Lamb is looking at ice crystals in the clouds, which play a surprisingly large role in influencing the climate. Some researchers are using cloud chambers, and are planning to set up cloud chambers…
An object moving through space at close to 1 million miles per hour has been detected, moving so fast that it is leaving the Milky Way galaxy. Scientists are now trying to identify this mysterious object.
Currently located 400 light-years away, the object known as CWISE J1249 is unlikely to be a spacecraft due to its massive size. It is approximately 30,000 times the mass of Earth, making it about 8% of the mass of the Sun.
This unusual size places J1249 somewhere between a star and a planet, as described by Dr. Darren Baskill, a lecturer in astronomy at the University of Sussex. According to Dr. Baskill, stars moving at such high speeds are rare.
The object’s speed is so rapid that it could exit the Milky Way galaxy in just a few tens of millions of years, which is a short period considering stars’ long lifespans.
This massive object, flying at 0.001% of the speed of light, has the potential to escape the galaxy and venture into intergalactic space.
Discovered by citizen scientists contributing to NASA’s Backyard Worlds: Planet 9 project, J1249’s speed is approximately 2.6 times faster than any space probe ever launched.
A new study, pending peer review, confirms these findings and further characterizes the object discovered through the initiative.
The object, with an unusual composition compared to stars and brown dwarfs, may be the first star of its kind in the galaxy, based on NASA’s observations.
Researchers believe the high-speed movement of the object may be linked to a supernova explosion in a binary star system or encounters with black holes in a star cluster.
Dr. Baskill suggests that gravitational slingshots could explain the extreme speed of J1249, potentially originating from the galaxy’s dense center and accelerated through gravitational interactions.
About our experts:
Dr. Darren Baskill is an Outreach Officer and Lecturer at the University of Sussex School of Physics and Astronomy, with a background in organizing astronomy-related events and competitions.
During the eruption of Mount Vesuvius in 79 A.D., residents were trapped under ash and rock, unable to escape. Surprisingly, a new study shows that some people did survive, only to meet their end later due to a different natural disaster.
The eruption covered the city in ash and rock particles for 18 hours, preserving the Roman inhabitants in a protective shell of solidified ash. However, experts discovered two skeletons in a house buried on top of the ash, rather than beneath it, indicating a massive earthquake as the cause of death.
Researchers investigating the house, Casa dei Pittori al Lavoro, noticed the absence of typical volcanic signs in the excavation near Vesuvius. Further examination revealed that the two men found in the house, around 50 years old, suffered severe injuries and were crushed by a collapsing wall due to the earthquake.
Scientists have discovered two skeletons in the ruins of a building in Pompeii and concluded that the cause of death was the collapse of a wall caused by an earthquake. – Image courtesy of Pompeii Archaeological Park
Residents who survived the initial eruption likely thought they were safe and attempted to flee, only to be met with powerful earthquakes. The combination of volcanic and seismic effects made it difficult to study the coincident earthquakes occurring at that time.
Researchers suggest that seismic activity during the eruption played a significant role in the destruction of Pompeii and may have affected the decisions made by its inhabitants facing imminent death.
The choice to name a new project the Dark Energy Spectroscopic Instrument (DESI) may come across as presumptuous. Dark energy, you see, is completely unseen; it does not emit any detectable light for a spectrometer to analyze. In fact, dark energy has never been directly observed and has managed to evade capture despite efforts made using the most advanced telescopes and detectors available.
As far as we understand it, dark energy is invisible, uniformly spread throughout space, does not interact with matter or light, and serves the sole purpose of accelerating the universe’s expansion through a mechanism that remains a mystery to us.
So, with the recent announcement of DESI’s initial data release, are we witnessing a shift in our comprehension of dark energy, as promised?
In the search for elusive dark energy, our observations offer limited insights: dark energy merely stretches space-time. To investigate different theories about dark energy, we must examine how this stretching occurred over cosmic time.
One method is to observe the universe’s expansion history, while another involves examining how matter accumulated within galaxies and clusters at various junctures in the universe’s past.
Efforts to measure the expansion rate often involve constructing a precise 3D map of the universe’s matter. By studying the spectra of light, we can determine how much it has stretched due to the universe’s expansion. By combining this information with accurate physical distances, we gain valuable insights into the universe’s evolution.
DESI’s new model has stirred speculation by proposing that dark energy may have a more intricate history than previously believed. If these indications prove to be accurate, they could revolutionize our understanding of not just the universe’s past, but also its eventual fate.
The Concordance Model of Cosmology outlines the prevailing model of the universe and its components. In this model, dark energy is viewed as a cosmological constant, providing a minimal flexibility to every part of space.
DESI and other surveys commonly report their dark energy findings in terms of an “equation of state” parameter denoted as w. A value of w = -1 is expected if dark energy behaves as a cosmological constant. Any deviation from this value implies a different characteristic for dark energy.
The recent DESI findings present a puzzling scenario: while a constant w of -1 aligns well with the results, a scenario where w is variable suggests a different interpretation. When combined with data from other sources, these results hint at a changing w, implying a varying impact of dark energy on the universe over time.
While the implications of these findings remain uncertain, they raise intriguing possibilities about the future course of the universe and the role of dark energy within it. Though still preliminary, these results suggest that dark energy may continue to surprise us in unforeseen ways in the future.
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