Tag Archives: explosions

Exploring Ultra-High-Energy Neutrinos: A Potential Window into Primordial Black Hole Explosions

Posted on by
Reply

Physicists from the University of Massachusetts Amherst have proposed that the ultrahigh-energy neutrinos detected by the KM3NeT experiment may indicate an exploding “sub-extreme primordial black hole,” hinting at new physics beyond the Standard Model.

The KM3NeT experiment observed neutrinos with energies around 100 PeV, and IceCube detected five neutrinos exceeding 1 PeV. The explosion of a primordial black hole may account for these high-energy neutrinos. Image credit: Gemini AI.

Black holes are a well-understood phenomenon, originating when a massive star exhausts its fuel and undergoes a supernova explosion, resulting in a gravitational force strong enough to trap light. These traditional black holes are massive and relatively stable.

However, as noted by physicist Stephen Hawking in 1970, primordial black holes potentially formed not from stars, but from the universe’s primordial conditions following the Big Bang.

Theoretical in nature, primordial black holes are dense enough that light cannot escape. Surprisingly, they are expected to be significantly lighter than the black holes observed to date.

Hawking also demonstrated that when these primordial black holes heat up, they emit particles through a phenomenon known as Hawking radiation.

“The lighter the black hole, the hotter it becomes, leading to increased particle emission,” explained Dr. Andrea Tam, a physicist at the University of Massachusetts Amherst.

“As a primordial black hole evaporates, it becomes lighter and hotter, releasing even more radiation during the explosive process.”

“What our telescope detects is, in fact, Hawking radiation.”

“If we were to witness such an explosion, we would create a comprehensive catalog of all elementary particles in existence, confirming both known particles, like electrons and quarks, and those not yet observed, including hypothesized dark matter particles.”

In 2023, the KM3NeT experiment successfully detected this elusive neutrino—a result Dr. Tam and his team had anticipated.

However, a challenge arose from the IceCube experiment, which failed to record similar phenomena or approach even a fraction of KM3NeT’s findings.

If primordial black holes are prevalent and detonating often, why are we not inundated with high-energy neutrinos? What could explain this inconsistency?

Dr. Joaquín Iguazu Juan, a physicist at the University of Massachusetts Amherst, suggested, “We believe a primordial black hole with a ‘dark charge’, termed a quasi-extreme primordial black hole, could bridge this gap.”

“Dark charge mimics standard electric force but features a heavy hypothesized electron, the dark electron.”

Dr. Michael Baker, also from UMass Amherst, remarked, “Our dark charge model is complex but may provide a more accurate depiction of reality.”

“It’s remarkable that our model explains this previously unexplainable phenomenon.”

Dr. Tam added, “Dark-charged primordial black holes possess unique properties that differentiate them from simpler primordial black hole models, allowing us to resolve all conflicting experimental data.”

The research team is optimistic that their dark charge model not only elucidates neutrino observations but also addresses the enigma of dark matter.

“Observations of galaxies and the cosmic microwave background imply the existence of some form of dark matter,” explained Baker.

“If our dark charge hypothesis holds, it could suggest a considerable number of primordial black holes, aligning with other astrophysical observations and accounting for the universe’s missing dark matter,” Dr. Iguazu-Juan stated.

“The detection of high-energy neutrinos represents a significant breakthrough,” remarked Baker.

“It opens a new window into the universe, enabling us to empirically verify Hawking radiation, gather evidence of primordial black holes, and explore particles beyond the Standard Model, while inching closer to solving the dark matter mystery.”

For more details, see the findings published in Physical Review Letters.

_____

Michael J. Baker and colleagues. We explain the PeV neutrino flux in KM3NeT and IceCube with quasi-extreme primordial black holes. Physics. Pastor Rhett, published online December 18, 2025. doi: 10.1103/r793-p7ct

Source: www.sci.news

Unusual Elements in Supernova Explosions May Influence Extraterrestrial Life

Posted on by
Reply

Supernova remnant Cassiopeia A

NASA/JPL-California Institute of Technology/O. Krauss (Steward Observatory)

Within Cassiopeia A, the youngest known supernova in our galaxy, scientists have uncovered unexpectedly high concentrations of chlorine and potassium. These elements, which possess an odd number of protons, are believed to be relatively rare in the universe but are crucial for the emergence of planets and life. Consequently, the findings regarding Cassiopeia A may influence our understanding of the potential locations for extraterrestrial life within the Milky Way.

Supernova remnants, or exploded stars, typically contain elevated levels of elements like oxygen and magnesium, with their cores being comprised of even-numbered protons. Elements with odd-numbered protons (often referred to as “odd Z” elements) are inherently less stable, leading to a reduced likelihood of being created via stellar nuclear fusion. This observation aligns with models of galactic chemical evolution that generally estimate meager quantities of odd Z elements.

“[As it stands] The source of these odd Z elements has been elusive.” Matsunagaumi from Kyoto University in Japan.

Matsunaga and his team recognized that high-resolution X-ray spectroscopy might shed light on the enigma. At the high temperatures prevalent in a supernova remnant, atoms lose electrons and emit unique X-ray signatures that sensitive instruments can detect. The X-ray Imaging Spectroscopy Mission (XRISM), launched in September 2023, is equipped to capture such data and conducted two observations of Cassiopeia A in December 2023.

To determine the abundance of each element, the researchers compared the faint signals from the odd Z elements against the stronger signals from even Z elements, like sulfur and argon, using them as stable reference points for more accurate measurements of the odd Z elements.

The findings revealed that the Cassiopeia A supernova generated significantly more chlorine and potassium than traditional models had anticipated. This indicates that theorists might need to reassess how large stars synthesize these uncommon elements, as certain widely accepted models fail to accommodate the specific conditions of Cassiopeia A.

“While the authors note that their observations diverge from previous models, the reality is more intricate,” says Stan Woosley of the University of California, Santa Cruz, who did not participate in the study. “Not all of our models are incorrect; some perform better than others, and certain ones correlate quite well. Importantly, these observations present astronomers with new, definitive data to refine their models and enhance our comprehension of massive stellar explosions.”

The recent measurements also empower Matsunaga and his colleagues to start evaluating various longstanding theories regarding the formation of odd Z elements in massive stars, including stellar rotation, interactions between binary star pairs, and the merging of diverse combustion layers deep inside stars. Up until now, there was no method to validate these theories against actual data.

“We still lack a complete understanding of which star types contributed to this,” states Katarina Rodders from Washington University in St. Louis, Missouri, who was not involved in the study. “Specifically, we lack clarity regarding the source of chlorine, an element abundant in our oceans.”

If these discoveries hold true for other supernova remnants, they could reshape our perceptions of how life-essential elements are distributed throughout the Milky Way. Depending on the star that seeded a planet, some areas may have a more favorable supply of life’s foundational materials than others. This raises the possibility of uneven distribution of extraterrestrial life across the galaxy.

“That is certainly a possibility,” Matsunaga remarked. “However, we cannot definitively assert this based on the current data.” It remains uncertain whether Cassiopeia A is singular in its production of such substantial quantities of odd Z elements or if it is indicative of supernova remnants in general. “Future observations of additional supernova remnants with XRISM and other upcoming instruments will be pivotal in addressing this issue.”

World capital of astronomy: Chile

Discover Chile’s astronomical marvels. Explore the world’s most advanced observatory and gaze at the stars beneath the clearest skies on the planet.

topic:

Source: www.newscientist.com

Integrated Fire Extinguisher: A Safeguard Against Battery Explosions

Posted on by
Reply

Lithium-based batteries, such as those used in electric vehicles, face the danger of overheating

yonhap/epa-fe/shutterstock

Batteries enhanced with polymeric materials that emit chemicals to suppress flames at elevated temperatures are considerably less prone to catching fire. This innovation can markedly improve the safety of battery-operated devices, including electric vehicles and medical equipment.

“Our method enhances safety in conventional liquid lithium batteries,” says Ying Chan from the Chemistry Institute of the Chinese Academy of Sciences. “It functions like a safety valve. These chemicals help to stifle flammable gases before they ignite, thus preventing fires.”

Zhang and her team developed and examined polymeric materials that extinguished flames in prototype lithium metal batteries. These batteries are presently being utilized, but upcoming versions are expected to potentially replace current batteries in electric vehicles and portable electronic gadgets. Lithium metals can store ten times more energy than widely used lithium-ion batteries by utilizing pure lithium in place of graphite for the negative electrodes.

The researchers incrementally raised the temperature of the prototype battery along with standard lithium metal batteries to 50°C. When the temperature exceeded 100°C, both batteries began to overheat, yet the special polymeric material in the prototype began to break down autonomously, releasing chemicals that functioned as “microscopic fire extinguishers.”

At temperatures surpassing 120°C, the standard battery without safety mechanisms overheated to 1000°C within 13 minutes and ignited. In contrast, under similar circumstances, the prototype battery’s peak temperature reached 220°C without any fire or explosion.

This “innovative material science strategy” suggests that it’s not only lithium metal batteries that can benefit, but also specific lithium-ion and lithium-sulfur batteries which may lower the risk of battery fires and overheating. Jaggit Nanda at the SLAC National Accelerator Laboratory, California, expresses that this could lead to safer batteries, especially for electric vehicles and aircraft.

Fire control technology has been incorporated into current battery manufacturing as a “short-term safety enhancement,” and the industry is actively seeking a long-term solution that encompasses alternative battery designs and materials, according to Zhang. However, she notes that integrating polymeric materials into the battery necessitates a re-manufacturing process.

topic:

Source: www.newscientist.com

Study Reveals Cambrian Explosions Happened Millions of Years Sooner Than Previously Believed

Posted on by
Reply

Paleontologists have studied the body shapes of Ediacaran Cambrian organisms by utilizing trace fossils as a stand-in for body fossils.

Reconstruction of early Cambrian marine life in southern China. Image credit: Dongjing Fu.

The Cambrian explosion is often referred to as a pivotal period in Earth’s history when distinct animal body plans emerged.

Most researchers indicate that this event took place between 541 and 530 million years ago, marking the onset of the Cambrian period.

“The Cambrian explosion represents a significant era in the history of life that poses numerous unresolved questions,” stated Dr. Olmo Miguez Saras from the University of Barcelona at the Museum of Natural History in London, alongside Dr. Zekun Wang.

“In investigating biodiversity during this period, paleontological studies primarily concentrate on organisms with hard structures.”

“Nevertheless, microfossil investigations open avenues for understanding the activities of hard, soft-bodied, or skeletal-deficient organisms preserved in stratigraphic records.”

“The microfossil evidence is essential for shedding light on the evolutionary phases dominated by soft-bodied faunas.”

“Fossil traces mirror the behaviors of habitat-forming organisms, determined by their environment and reactions to ecological factors.”

“Consequently, these traces act as indicators of the paleoecological conditions experienced by the organisms that produced them.”

In their research, the authors concentrated on trace fossils from the Ediacaran-Cambrian transition, a period of great paleobiological interest that represents a pivotal moment in the evolution of complex life on Earth.

This transition experienced substantial shifts in biodiversity as well as the structure of organisms and ecosystems.

“The Ediacaran fauna consisted mainly of complex, multicellular, flexible organisms,” noted Dr. Miguez Saras.

“The shift to the Cambrian era involved numerous extinctions within the Ediacaran fauna, accompanied by a rapid diversification of complex multicellular organisms possessing hard structures (e.g., exoskeletons).”

“This encapsulates the core of evolutionary development that led to the emergence of the most modern animal phyla, commonly referred to as the Cambrian Explosion.”

The research indicates that slender-bodied organisms thrived around 545 million years ago during the Ediacaran period.

“These organisms likely possessed a coelomic hydrostatic body with an anteroposterior axis, muscles, and perhaps segmented structures,” Dr. Miguez Saras explained.

“Additionally, these organisms may have exhibited directional movement and possessed sensory capabilities to navigate and feed on diverse substrates in environments dominated by microbial mats.”

“Thus, the so-called Cambrian explosion and its evolutionary significance could have arisen significantly earlier than previously thought.”

“These adaptations in body shape and mobility facilitated early animals in thriving within increasingly dynamic and complex environments, an ecological engineering process that could spur evolutionary innovation.”

The team’s study is slated for publication in the journal Geological.

____

Zekun Wang & Olmo Miguez-Salas. Quantitative decoding of Ediacaran Motion Microfossil Morphology: Evidence for the appearance of elongated anteroposterior body profiles. Geological Published online on June 9th, 2025. doi: 10.1130/g53332.1

Source: www.sci.news

IXPE Measures X-Ray Polarization from Magnetic Explosions

Posted on by
Reply

A magnetor is a type of neutron star that boasts an extraordinarily strong magnetic field, approximately one times stronger than Earth’s magnetic field. These colossal magnetic fields are believed to be generated when rapidly rotating neutron stars are birthed from the collapse of a giant star’s core. Magnetars emit brilliant X-rays and display erratic patterns of activity, with bursts and flares releasing millions of times more energy than the Sun emits in just one second. Polarization measurements offer insights into magnetic fields and surface characteristics. This was the focus of astronomers using the NASA Imaging X-ray Polarization Explorer (IXPE) to study 1E 1841-045, a magnetor located within Supernova Remnant (SNR) KES 73, situated nearly 28,000 light years from Earth. The findings are published in the Astrophysics Journal Letter.

Impressions of Magneter artists. Image credit: NASA’s Goddard Space Flight Center/S. Wesinger.

Magnetors represent a category of young neutron stars. They are the remnants of giant stars that collapsed in on themselves at the end of their life cycles, resembling the mass of the Sun but compressed into a city-sized volume.

Neutron stars exemplify some of the most extreme physical conditions in the observable universe, offering a unique chance to investigate states that cannot be replicated in terrestrial laboratories.

The 1E 1841-045 magnetor was observed in an explosive state on August 21, 2024, by NASA’s Swift, Fermi, and other advanced telescopes.

The IXPE team has permitted several requests to pause scheduled observations of the telescope multiple times each year, redirecting focus to unique and unexpected celestial phenomena.

When 1E 1841-045 transitioned into this bright active phase, scientists chose to direct IXPE to capture the first polarization measurements of the magnetor’s flare.

Magnetors possess magnetic fields thousands of times stronger than most neutron stars, hosting the most powerful magnetic fields among known cosmic entities.

These extreme magnetic field fluctuations can lead to the emission of X-ray energies up to 1,000 times greater than usual for several weeks.

This heightened state is referred to as explosive activity, though the underlying mechanisms remain poorly understood.

IXPE’s X-ray polarization measurements may help unveil the mysteries behind these phenomena.

Polarized light carries information about the direction and orientation of emitted X-ray waves. A higher degree of polarization indicates that the X-ray waves are moving in harmony, akin to a tightly choreographed dance.

Studying the polarization characteristics of magnetors provides clues regarding the energy processes associated with observed photons and the direction and configuration of the magnetor’s magnetic field.

This diagram illustrates the IXPE measurements of X-ray polarized light emitted by 1E 1841-045. Image credit: Michela Rigoselli / Italian National Institute of Astrophysics.

IXPE results, supported by NASA’s Nustar and other telescope observations, indicate that X-ray emissions from 1E 1841-045 exhibit increased polarization at higher energy levels while maintaining a consistent emission direction.

This significant contribution to the high degree of polarization is attributed to the hard X-ray tail of 1E 1841-045, a highly energetic component of the magnetosphere responsible for the highest photon energies detected by IXPE.

Hard X-rays refer to X-rays characterized by shorter wavelengths and greater energy than soft X-rays.

While prevalent in magnetars, the processes that facilitate the generation of these high-energy X-ray photons remain largely enigmatic.

Despite several proposed theories explaining this emission, the high polarization associated with these hard X-rays currently offers additional clues to their origins.

“This unique observation enhances existing models that aim to explain magnetic hard X-ray emissions by elucidating the extensive synchronization seen among these hard X-ray photons,” remarked a student from George Washington University. First paper.

“This effectively demonstrates the power of polarization measurements in refining our understanding of the physics within a magnetar’s extreme environment.”

“It would be fascinating to observe 1E 1841-045 as it returns to its stable baseline state and to track the evolution of polarization,” added Dr. Michela Rigoselli, an astronomer at the National Institute of Astrophysics in Italy. Second paper.

____

Rachel Stewart et al. 2025. X-ray polarization of Magnetor 1E 1841-045. apjl 985, L35; doi: 10.3847/2041-8213/adbffa

Michela Rigoselli et al. 2025. IXPE detection of highly polarized X-rays from Magnetor 1E 1841-045. apjl 985, L34; doi: 10.3847/2041-8213/adbffb

Source: www.sci.news

Australian Museums Utilize Technology to Engage Visitors with Volcanic Explosions every 15 minutes

Posted on by
Reply

IIt begins with a soft rumble, then an explosion, and finally a thunderous roar. Pyroclastic flows spew out from volcanoes and race towards us at alarming speeds. A cascade of volcanic ash seems to be pelting the surrounding space – technically, it’s the distinctive pumice gravel from Mount Vesuvius – and for a few moments, patrons at the National Museum of Australia are transported to the 1,946-year-old tragedy in Pompeii.

Immersive experiences, including increasingly advanced virtual reality technology, are gaining popularity in museums despite criticism from scholars that flashy special effects may divert viewers from the actual artifacts and exhibits. It has shifted from being a mere gimmick to a successful exhibition to a crucial component in educating future generations, assuming that the primary purpose of museums is entertainment.

Laurent Dondy, the head of development and international tours at Grand Palais Immersif, the French company involved in creating Pompeii, acknowledges some of the apprehensions regarding immersive technology in museums.

“Sorry, but I don’t want to see Van Gogh smoking or scratching his head,” he explains. “Our approach is a blend of art and science. Technology plays a role in the creative process that surprises people and can undoubtedly add a layer of enjoyment to the experience.”

Pompeii is now on display at the National Museum of Australia in Canberra, offering hourly exhibitions showcasing Mount Vesuvius. While the immersive encounter is included in the admission price, other high-budget productions in Australia necessitate separate headsets and seats due to technology requirements, resulting in extra charges that can escalate the cost of a family day at the museum to hundreds of dollars.

Over 500,000 individuals attended the record-breaking ‘Ramses and the Gold of the Pharaohs’ exhibition at the Australian Museum in Sydney, with a quarter opting for the additional $30 fee for the VR component per person. We decided to queue for the opportunity to participate.

Visitors to the Australian Museum’s ‘Ramses and the Gold of the Pharaohs’ exhibition. Photo: David Gray/AFP/Getty Images

The Australian Museum’s latest hits, Machu Picchu and the Golden Empire of Peru, mark the museum’s fourth stage production with an immersive element.

And according to its director Kim McKay, this technology is here to stay.

“In today’s world, we must provide people with experiences, and I believe museums should not be exempt from that,” she asserts. “Museums need to evolve. Like everything else, we can’t be anchored in the past; we must embrace new and evolving technologies.”

“Children now anticipate digital enhancements, and as museum leaders, it is our responsibility to determine how to effectively integrate this technology to maintain an authentic experience. It’s a fine balance.”

Gedeon Experience, the creative force behind Pompeii’s special effects, gained exclusive access to archaeological digs in inaccessible areas, documenting the daily efforts of archaeologists for two years and using CGI to reconstruct the city’s streets and buildings.

Instead of detracting from the visitor experience, this spectacle enriches and complements the over 90 items borrowed from the Pompeii Archaeological Park, including frescoes, mosaics, jewelry, sculptures, and domestic objects.

The Director of the University of Sydney’s Museums and Heritage Program highlights a prime selection of must-see exhibitions from Australia’s museums and galleries.

However, the drawback is that technology inflates exhibition budgets, leading to increased ticket prices.

“They are costly, and there is fierce competition to incorporate the latest digital technologies,” O’Reilly remarks.

Having attended the initial Pompeii exhibition in Paris in 2020, O’Reilly notes that the visual effects of the exhibition are mostly consistent with other immersive exhibitions encountered abroad over the following four years.

“A well-executed immersive exhibit can provide a profound layering of experience and knowledge, but outdated technology may disappoint some visitors. The pace of [developments] is incredibly rapid,” she observes.

“The audience is quite demanding. Game resolutions are astoundingly high. For immersive content and narrative delivery, we now expect the caliber we encounter in gaming. It’s an intimate, detailed experience, and museum-goers will anticipate a commensurate level of quality.”

Is there a risk that future generations lacking technological acumen may fail to grasp the significance of the displayed artifacts?

“Possibly, but without those innovations to begin with, they might not have engaged in the first place,” O’Reilly remarks. “Their expectations will differ from those of previous generations.”

Perhaps not. McKay recounts that when the Australian Museum polled 100 children about their desires for future museums, they anticipated “screens everywhere.”

“That wasn’t the case. They requested ‘more spiders, more sharks, more snakes.’ They sought greater authenticity,” she concludes.

Source: www.theguardian.com

Astronomers believe at least two supernova explosions produced supernova remnant 30 Doradas B

Posted on by
Reply
30 Doradas BThis galaxy, also cataloged as NGC 2060, is discovered in the Large Magellanic Cloud, a small satellite galaxy of the Milky Way.


At the center of this complex landscape of bright, colorful gas clouds is the supernova remnant 30 Doradas B. Image credit: NASA / CXC / Pennsylvania State University / Townsley other. / STScI / HST / JPL / CalTech / SST / SAO / J. Schmidt / N. Wolk / K. Arcand.

30 Doradus B is part of a large star-forming region where stars have been forming continuously over the past 8 to 10 million years.

It is located 160,000 light-years from Earth in the Large Magellanic Cloud, a complex landscape of dark clouds of gas, young stars, high-energy shocks, and superheated gas.

In a new study, astronomer Weian Chen of National Taiwan University and his colleagues used 30 high-resolution images of the Doradas B type from several telescopes on the ground and in space, including NASA/ESA's Hubble Space Telescope and the Australian Square Kilometer Array Pathfinder. The resolution multi-wavelength images were analyzed. , NASA's Spitzer Space Telescope and Chandra X-ray Observatory.

Researchers detected a faint X-ray shell about 130 light-years in diameter.

Chandra's data also revealed that 30 Doradas B contains a wind of particles blown away from the pulsar, forming what is known as a pulsar wind nebula.

Combining data from Hubble and other telescopes, researchers determined that a single supernova explosion could not explain what they were seeing.

Both the pulsar and the bright X-rays seen at the center of Doradas 30 B may have resulted from a supernova explosion after the collapse of a massive star about 5,000 years ago.

But the larger, dimmer X-ray shell is too large to have come from the same supernova.

“Rather, we believe that at least two supernova explosions occurred in Doradas 30 B, using X-ray shells produced by another supernova more than 5,000 years ago,” the scientists said.

“It's quite possible that more has happened in the past.”

“These results will help us learn more about the lives of massive stars and the effects of supernova explosions.”

a paper Regarding the survey results, astronomy magazine.

_____

Chen Weian other. 2023. New insights about 30 Dor B revealed by high-quality multiwavelength observations. A.J. 166, 204; doi: 10.3847/1538-3881/acff72

Source: www.sci.news