Evidence suggests that Mars once hosted significant amounts of water. Past studies indicate that the majority of atmospheric water loss occurs during the Martian southern summer. During this season, warm and dusty conditions allow water vapor to ascend to high altitudes, where it escapes into space without condensing. A groundbreaking study has unveiled a previously unidentified pathway for water loss, observed for the first time in the Martian northern summer. This research highlights how a localized, short-lived sandstorm in Mars Year 37 (August 2023) caused a surge in water vapor.
Close-up color image of a small dust storm on Mars, captured by ESA’s Mars Express’ HRSC instrument in April 2018. Image credit: ESA / DLR / FU Berlin / CC BY-SA 3.0 IGO.
Dr. Adrian Brines, a researcher at the Andalusian Institute of Astronomy and the University of Tokyo, stated, “Our findings reveal the impact of this type of storm on Earth’s climate evolution and open new avenues for understanding how Mars has lost water over time.”
While dust storms have long been recognized as significant contributors to water escape on Mars, previous discussions primarily focused on large-scale dust events occurring on a planetary scale.
In this study, Dr. Brines and colleagues demonstrated that smaller, localized storms can significantly enhance the transport of water vapor to high altitudes, where it is lost to space more readily.
Prior research concentrated on the warm and dynamic summers of the Southern Hemisphere, as this is the primary period for water loss on Mars.
The recent study detected an unusual spike in water vapor in Mars’ middle atmosphere, attributed to a localized dust storm during the northern hemisphere summer of Martian year 37.
Diagram demonstrating the atmospheric response to localized sandstorms in the Northern Hemisphere during summer. High dust concentrations significantly enhance solar radiation absorption, promoting atmospheric warming, especially in the middle atmosphere. This increased circulation enhances the vertical transport of water vapor, facilitating its injection at high altitudes and increasing hydrogen efflux from the exobase. Image credit: Brines et al., doi: 10.1038/s43247-025-03157-5.
This surge in water vapor was unprecedented, reaching levels up to 10 times higher than normal—an occurrence not predicted by existing climate models or observed in previous Martian epochs.
Following this event, the amount of hydrogen in Mars’ exobase—where the atmosphere transitions into space—also rose significantly, increasing by 2.5 times compared to the previous year.
Understanding how much water Mars has lost over time hinges on measuring the hydrogen that escapes into space, as this element is produced when water decomposes in the atmosphere.
Dr. Shohei Aoki, a researcher at the University of Tokyo and Tohoku University, noted, “These results provide a crucial piece to the incomplete puzzle of how Mars has persistently lost water over billions of years, demonstrating that brief but intense episodes can significantly influence the evolution of Mars’ climate.”
Discover more about these findings in the featured study, published this week in Communication: Earth and Environment.
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A. Brines et al. 2026. Unseasonal water escape during summer in Mars’ northern hemisphere caused by localized strong sandstorms. Communication: Earth and Environment 7, 55; doi: 10.1038/s43247-025-03157-5
Over two years of data collected on Mars by the SuperCam microphone on NASA’s Perseverance rover has led planetary scientists to identify 55 triboelectric discharge events linked to dust devils and dust storms.
Detection of electrical discharges in dust devils by the SuperCam instrument aboard NASA’s Perseverance rover on Mars. Image credit: Nicholas Sarter.
Lightning and electrical phenomena have been observed on Earth, Saturn, and Jupiter within our solar system.
While the possibility of electrical activity on Mars has been hypothesized, it has never before been directly recorded.
The Martian surface, characterized by frequent dust activities and phenomena such as wind-driven dust, sandstorms, and dust devils, can lead to electrical charges similar to those seen on Earth.
Determining whether such electrification occurs on Mars is vital for understanding the planet’s surface chemistry and assessing the safety of future robotic and human exploration missions.
To investigate this, Baptiste Chide and colleagues from the University of Toulouse examined 28 hours of audio recordings from the Perseverance rover’s SuperCam microphone gathered over two years.
The researchers categorized 55 electrical events by detecting interference and acoustic signatures typical of lightning.
Notably, 54 of these events were linked to the strongest wind events recorded during the study, indicating that winds significantly contribute to Martian electrification.
In two encounters with dust devils alone, the spacecraft documented 16 events, suggesting the likelihood of additional, more distant discharges that may have escaped detection by the microphone.
These findings imply that the Martian atmosphere is particularly electrically active during localized dust activity, rather than during wider dusty seasons.
“On Earth, atmospheric electricity primarily results from charge accumulation in clouds and storms, which burst forth as lightning,” remarked Dr. Ricardo Hueso from the University of the Basque Country.
“Conversely, on Mars, atmospheric electricity is dry, generated through collisions between dust particles in whirlwinds and sandstorms, leading to much smaller electrical discharges compared to Earth.”
Dr. Agustín Sánchez Labega, also from the University of the Basque Country, noted: “Mars’ cold, dry, dusty environment features a thin atmosphere of carbon dioxide and can generate very strong winds, creating gusts, whirlwinds, and dust clouds.”
“These phenomena can form extensive storm fronts that stretch hundreds of kilometers and sometimes envelop the entire planet in dust.”
“Thus, we anticipate these once-elusive discharges to be particularly prevalent under such conditions.”
The authors concluded, “Our study raises many questions regarding the impact of natural electricity on the Martian atmosphere.”
For more details, check their paper, published in the Journal on November 26, 2025, in Nature.
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B. Chide et al. 2025. Triboelectric discharges detected during Martian dust events. Nature 647, 865-869; doi: 10.1038/s41586-025-09736-y
By utilizing data from the NASA/ESA/CSA James Webb Space Telescope along with ESO’s Very Large Telescope (VLT), two separate teams of astronomers have captured mid-infrared images of a system featuring four intricate spirals of dust encircling a pair of aging Wolf-Rayet stars located in a system known as Apep (2XMM J160050.7-514245).
Webb’s mid-infrared images reveal four coiled dust shells surrounding two Wolf-Rayet stars known as Apep. Image credits: NASA / ESA / CSA / STScI / California Institute of Technology Yeahuo Han / Macquarie University Ryan White / Alyssa Pagan, STScI.
Wolf-Rayet stars represent a rare class of massive binary stars where the universe’s earliest carbon is formed.
There are estimated to be only around 1,000 of these stars in the Milky Way galaxy, which contains hundreds of billions of stars in total.
Among the multiple Wolf-Rayet binaries observed so far, the Apep system stands out as the sole example of having two such Wolf-Rayet stars within our galaxy.
In a recent study, astronomer Ryan White from Macquarie University and his team set out to refine the orbital characteristics of the Wolf-Rayet stars in the Apep system.
They integrated precise ring position measurements from the Webb images with the shell’s expansion rate obtained over eight years of VLT observations.
“This is a unique system with a very extended orbital period,” White mentioned.
“The next longest orbit for a dusty Wolf-Rayet binary is roughly 30 years, while most orbits tend to span between 2 and 10 years.”
One of the team’s papers was published concurrently in the Astrophysical Journal alongside another study led by astronomer Yinuo Han from the California Institute of Technology.
“Observing the new Webb data felt like stepping into a dark room and flipping on a light switch. Everything became visible,” Dr. Han remarked.
“Dust is abundant throughout the Webb image, and telescope observations indicate that much of it is fragmenting into repeating and predictable structures.”
Webb’s observations yielded unprecedented images. It produced a clear mid-infrared image revealing a system of four swirling spirals of dust, each expanding in a consistent pattern. Ground-based telescopes had only identified one shell prior to Webb’s discoveries.
By merging Webb imagery with several years of VLT data, they refined the orbital frequency of the star pairs to every 190 years.
Within this remarkably lengthy orbit, the star approaches closely for 25 years, enabling dust formation.
Additionally, Webb’s observations confirmed the existence of three stars that are gravitationally bound to each other in this system.
The dust expelled by the two Wolf-Rayet stars is being cleaved by a third star, a massive supergiant, which creates holes in the dust cloud emanating from its expansive orbit.
“Dr. Webb has provided us with the ‘smoking gun’ evidence to confirm that a third star is gravitationally linked to this system,” Dr. Han noted.
Researchers were aware of this third star since VLT observed its brightest inner shell in 2018, but Webb’s findings helped refine the geometric model and reinforced the connection.
“We unraveled several mysteries with Webb,” Dr. Han added.
“The lingering mystery remains the precise distance from Earth to the star, which will necessitate further observations.”
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Ryan MT White et al. 2025. Snake eating its own tail: Dust destruction of the Apep impact wind nebula. APJ 994, 121; doi: 10.3847/1538-4357/adfbe1
Han Yinuo et al. 2025. JWST reveals the formation and evolution of dust in APEP, a binary star with colliding winds. APJ 994, 122; doi: 10.3847/1538-4357/ae12e5
Google has introduced its third-generation foldable phone, now the first completely waterproof and dustproof model on the market. It’s touted as being more robust than any existing phone, featuring cutting-edge AI and a collection of adaptive cameras.
The Pixel 10 Pro Fold enhances last year’s highly praised 9 Pro Fold by eliminating the hinge mechanism along the spine. This improvement addresses the dust issue that has plagued previous foldable devices, thereby elevating its usability beyond that of typical flat phones.
However, similar to other foldable smartphones, the Pixel comes with a hefty price tag of £1,749 (€1,899/$1,799/AU$2,699), significantly higher than the £1,199 Pixel 10 Pro XL and comparable to the similarly priced Samsung Galaxy Z Fold 7.
According to Google, the Pixel 10 Pro Fold’s innovative gearless hinge can endure over ten years of folding. Photo: Samuel Gibbs/The Guardian
Beyond the enhanced durability, there are minimal design modifications compared to the Pixel 9 Pro Fold. The outer display is marginally larger due to slimmer bezels, and both screens are a bit brighter. When closed, the Fold is perfectly shaped for mobile tasks, while its spacious internal screen elegantly accommodates two full-sized apps side-by-side.
Nonetheless, the Pixel feels quite hefty and somewhat bulky in contrast to Samsung’s unexpectedly slim and lightweight Z Fold 7. Weighing in at 258g, it’s comfortable to handle and fits in your pocket, yet remains notably thicker than standard phones and its modern competitors.
The inclusion of Qi2 charging compatibility enhances its versatility with various magnetic accessories, including the Superior Magnetic Accessories. Twelve South Curve Nano stand (left) and QDOS SnapStand Qi2 Charger (right). Photo: Samuel Gibbs/The Guardian
The Fold operates on the same Google Tensor G5 chip utilized across the Pixel 10 lineup, equipped with 16GB of RAM and a minimum of 256GB of storage. Its performance aligns with that of the Pixel 10 Pro, providing snappy responsiveness and managing tasks effortlessly. Nonetheless, for the top frame rates in high-end gaming, a device with Qualcomm’s premier Snapdragon chip has an advantage.
As with all foldable models, the Fold’s battery life shifts significantly based on which display you predominantly use. With approximately 5 hours of active screen time on a bright day, evenly split between the inner and outer displays while mostly on Wi-Fi, the Pixel achieved around 38-40 hours between charges. On heavily 5G days with extensive screen usage, it lasted about 28 hours, concluding the day with 25% battery remaining. While this isn’t unacceptable, it certainly lags behind its top competitors and larger screens such as the Pixel 10 Pro XL.
To achieve a full charge, it takes 90 minutes and reaches 50% in just 30 minutes with a 30W or higher USB-C power adapter (sold separately). It also supports 15W Qi2 wireless charging. Photo: Samuel Gibbs/The Guardian
Water Resistance: IP68 (30 minutes at a depth of 1.5 meters)
Dimensions when folded: 155.2×76.3×10.8mm
Unfolded Dimensions: 155.2×150.4×5.2mm
Weight: 258g
Android 16, Magic Cue, Gemini
If you’re running two apps simultaneously on your screen, you can slide one out of the way for additional space. Tap it to restore the app to full screen. Photo: Samuel Gibbs/The Guardian
The Fold operates on the same Android 16 software found across the Pixel 10 Pro lineup, featuring a vibrant and colorful exterior while integrating advanced AI tools throughout the device.
Key features include the Gemini chatbot, which can observe and interpret user interactions, engage with different apps, and overall provide greater utility. Additionally, there’s an innovative real-time translation system for calls, replicating the caller’s voice directly.
A notable addition is Magic Cue, a discreet assistant that functions in the background, synthesizing information from various Google services and presenting it when pertinent. For example, if a friend texts asking for flight details, it can suggest corresponding information from your calendar for easy sharing. Likewise, when contacting a business, relevant order details from Gmail are displayed in your phone app.
Moreover, the Fold has been optimized to fully utilize the expansive internal display. A taskbar at the bottom facilitates quick app placement into split screen mode. Similar to the Honor Magic V5 and OnePlus Open, it allows for resizing apps across the screen’s borders, offering increased adaptability when multitasking with two apps.
The Fold also includes subscriptions for Google AI Pro at £19 a month for the first year, granting access to more robust Gemini AI models along with 2TB of cloud storage for photos, documents, and emails. The device is also eligible for software updates until October 2032.
Sustainability
The recycled aluminum framework offers a premium and sturdy feel. Photo: Samuel Gibbs/The Guardian
The battery is rated to endure over 1,000 full charging cycles, maintaining at least 80% of its original capacity. The phone can be repaired by Google, at third-party services, or through self-repair options with available manuals.
The Pixel 10 Pro Fold comprises 29% recycled materials by weight, including aluminum, cobalt, copper, glass, gold, plastic, rare earth elements, tin, and tungsten. The company provides insights on the lifecycle impacts of its products in its report and offers to recycle old devices for free.
Camera
The camera application offers multiple functionality modes, but shooting images is most efficient when the Pixel is closed, much like a traditional smartphone. Photo: Samuel Gibbs/The Guardian
The 10 Pro Fold features a camera system comparable to last year’s 9 Pro Fold and the new Pixel 10. It includes a 48MP primary camera, a 10.5MP ultra-wide camera, a 10.8MP 5x telephoto camera that can outperform rivals in its class, along with two 10MP selfie cameras.
The primary camera captures excellent images across various conditions, though some blurriness and graininess may occur in low-light scenarios. Google’s Night Mode remains the industry’s best for darker environments. The ultra-wide-angle camera performs well, and the 5x optical zoom telephoto lens effectively closes distances to subjects, although detail may falter in less-than-ideal lighting. While the camera consistently delivers high-quality photos and videos, it doesn’t entirely meet the high standards expected from the Pixel 10 Pro line at this price point.
The Fold comes with unique features such as the ability to utilize the main camera for selfies, alongside various shooting modes that engage both displays while at a partially folded position. A captivating “Made You Look” option plays a lively animation on the outer screen that captures your child’s attention, allowing you to seize the perfect moment. Regrettably, this feature employs one of the selfie cameras instead of the primary one, prioritizing fun over quality.
Price
Pricing for the Google Pixel 10 Pro Fold starts at £1,749 (€1,899/$1,799/2,699 AUD).
For reference, the Pixel 10 is priced at £799, the Pixel 10 Pro at £999, and the Pixel 10 Pro XL at £1,199. In comparison, the Samsung Galaxy Z Fold 7 retails for £1,799, while the Honor Magic V5 is available for £1,699.99.
Verdict
The Pixel 10 Pro Fold represents a subtle improvement over last year’s exceptional 9 Pro Fold, but its true influence may unfold in the future. As the first genuinely dustproof foldable device, it establishes a new durability standard, gradually aligning itself with conventional flat phones.
That said, the inner screen is inherently softer than regular tempered glass to accommodate folding, necessitating careful handling to avoid marks.
The addition of Qi2 magnetic accessories and charging support is a valuable enhancement for the Fold, as it is across other Pixel models. This phone offers impressive speed, reasonable battery life, efficient software, and leading-edge AI capabilities. The camera is competent for foldable devices, though it doesn’t quite match up to regular smartphones.
The Pixel does a commendable job of functioning as a standard phone when closed and a versatile tablet when expanded, though it is bulkier and heavier than the noticeably sleeker Samsung Galaxy Z Fold 7.
Pros: Combines the functionality of a phone and tablet, waterproof and dust resistant, supports Qi2 magnetic accessories and charging, fantastic tablet display, powerful performance, excellent camera with 5x zoom, rich AI features including Magic Cue, accompanied by a year of Google AI Pro service, and 7 years of software updates.
Cons: High price point, more fragile than standard devices, costly repairs, thicker and heavier, the camera doesn’t rival the regular Pixel 10 Pro, battery performance could improve, and lacks advanced features for power users in comparison to competitors.
In its closed form, the Pixel 10 Pro Fold approximates the size of an ordinary smartphone. Photo: Samuel Gibbs/The Guardian
Thanks to the NASA/ESA/CSA James Webb Space Telescope, astronomers have made significant progress in understanding the connection between the raw materials of rocky planets. This cosmic material—crystalline silicate dust and polycyclic aromatic hydrocarbons—was analyzed in the core of the remarkable bipolar planetary nebula known as the Butterfly Nebula.
Hubble and Webb/Alma images of Butterfly Nebula. Image credits: NASA/ESA/CSA/Webb/Hubble/Alma/Matsuura et al. , doi: 10.1093/mnras/staf1194.
The Butterfly Nebula, also referred to as NGC 6302, is among the most extensively studied planetary nebulae.
This nebula is situated approximately 2,417 light years away from Earth, in the constellation Scorpio.
Its distinctive butterfly shape has expanded over two light years, roughly half the distance from the Sun to Proxima Centauri.
The object exhibits extreme bipolarity, complex morphology, and features very high excitation gases, high molecular weight, and crystalline silicates.
“The planetary nebula is one of the most stunning and elusive phenomena in the cosmic landscape,” stated Mikako, an astronomer from Cardiff University, along with Matsui Ko and her colleague.
“These nebulae form when stars with masses between 0.8 and 8 times that of the Sun shed most of their mass at the end of their lifecycle.”
“The nebula phases on planets are transient, lasting only about 20,000 years.”
“Despite their name, planetary nebulae have no connection to planets. The confusion arose centuries ago, when astronomers noted that these nebulae appeared round, resembling planets.”
“Although many planetary nebulae are not round, their titles often reflect misleading names, and the Butterfly Nebula is a prime illustration of the extraordinary shapes these nebulae can assume.”
“As a bipolar nebula, the Butterfly Nebula has two lobes extending in opposite directions, forming what resembles butterfly ‘wings’,” they continued.
“The dark band of dusty gas acts as the ‘body’ of the butterfly. This band is actually a donut-shaped torus that conceals the central star of the nebula.”
“Dusty donuts may indeed contribute to the insect-like shape of the nebula by hindering gas from escaping outward from the star uniformly.”
New images from Webb’s Mid-Infrared Instrument (MIRI) offer a close-up view of the center of the Butterfly Nebula and its dusty torus, revealing its complex structure like never before.
Astronomers have detected nearly 200 spectral lines, each providing insights into the nebula’s atoms and molecules.
These lines uncover nested interconnected structures tracked by various species.
Researchers have also pinpointed the central star in the Butterfly Nebula, which heats a previously undetected dust cloud surrounding it, causing it to emit bright light at mid-infrared wavelengths.
The star boasts a temperature of 220,000 Kelvin, making it one of the hottest known central stars in the galaxy’s planetary nebulae.
This image takes viewers diving deep into the heart of the Butterfly Nebula, as seen by Webb. Image credit: NASA/ESA/CSA/WEBB/M. MATSUURA/ALMA/ESO/NAOJ/NRAO/N. HIRANO/M. ZAMANI.
“This incredible, radiant engine is responsible for the stunning brilliance of the nebula, yet its full effect is moderated by the dense band of thin gas, the torus, that surrounds it,” the author noted.
“New data from Webb reveals that the torus comprises crystalline silicates such as quartz and irregularly shaped dust particles.”
“Dust grains measure about one millionth of a meter, typical for space dust.”
“Beyond the torus, emissions from various atoms and molecules form multilayer structures.”
“Ions needing the highest energy to form cluster near the center, while those requiring less energy are positioned farther away from the central star.”
“Iron and nickel are particularly noteworthy, following jets that erupt outward from the star in opposite directions.”
In an intriguing finding, the team also identified light emitted by carbon-based molecules known as polycyclic aromatic hydrocarbons (PAHs).
“These molecules have a flat, ring-like configuration, reminiscent of honeycomb shapes found in beehives,” said the astronomer.
“On Earth, PAHs are often present in smoke from campfires, vehicle exhausts, or burnt toast.”
“Given their location, these PAHs likely form when the winds from the central star push against the surrounding gas.”
“This discovery marks the first evidence of PAH formation in oxygen-rich planetary nebulae, offering a glimpse into the processes behind their formation.”
Survey results were published this week in the Monthly Notices of the Royal Astronomical Society.
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Mikako Matsumura et al. 2025. JWST/MIRI view of Planetary Nebula NGC 6302 – I. UV irradiated torus and hot bubbles cause PAH formation. mnras 542(2):1287-1307; doi:10.1093/mnras/staf1194
San Juan, Puerto Rico – Enveloped in a significant amount of dust clouds from the Sahara Desert, the Caribbean is headed towards the US on Monday for one of the year’s most noteworthy events.
These clouds have expanded from Jamaica, stretching approximately 2,000 miles (3,200 kilometers) past Barbados in the Eastern Caribbean, and about 750 miles (1,200 kilometers) from the Turks and Caicos Islands down to Trinidad and Tobago.
“It’s quite remarkable,” noted Alex Dasilva, a hurricane expert at Accuweather.
The hazy skies have triggered sneezing, coughing, and watery eyes throughout the Caribbean. Local meteorologists are advising individuals with allergies, asthma, or other respiratory issues to stay indoors or wear face masks when outside.
Idiana Zayas, a forecaster at the National Weather Service in San Juan, Puerto Rico, reported elevated dust levels.
As per the National Oceanic and Atmospheric Administration, an aerosol’s optical depth quantifies how many particles obstruct sunlight from reaching the ground.
The plume is anticipated to reach Florida, Louisiana, Alabama, and Mississippi later this week and over the weekend, Dasilva mentioned.
However, he indicated that plumes often lose much of their density in the Eastern Caribbean.
“These islands typically face higher concentrations that can partially block sunlight, leading to more noticeable effects,” he remarked.
The dry, dusty air known as the Saharan air layer originates from the African Sahara Desert and travels westward from around April to October, according to NOAA. It also hinders the formation of tropical waves during the Atlantic hurricane season, which runs from June 1 to November 30.
June and July generally see the highest average dust concentrations, with plumes moving between 5,000 and 20,000 feet above ground, Dasilva pointed out.
In June 2020, record levels of Sahara dust filled the Caribbean. The scale and density of the plume were unprecedented in half a century, prompting forecasters to label it the “Godzilla Dust Cloud.”
Public domain sources from CBW/Alamy/Access rights
The base of future moons could be powered by solar cells made on-site from the melted moon dust.
Building items on the moon using materials already there is more practical than shipping them from the Earth. when Felix Lang He heard about this idea at the University of Potsdam in Germany and knew what to do right away. “We have to make solar cells like this, we have to make them right away,” he says.
Two years later, Lang’s team built and tested several solar cells that featured lunar dust as an ingredient. Another important component is a crystal called halide perovskite, which contains elements such as lead, bromine, and iodine, as well as long molecules of carbon, hydrogen and nitrogen.
The team melted a synthetic version of the lunar regolith, a layer of loose rock and dust that covers the moon, into “Moonglass.” Because they did not refine the regolith, the mungrass was less transparent than traditional solar cells. However, Lang says the team’s best prototype still reached around 12% efficiency. More traditional perovskite solar cells typically reach an efficiency close to 26%. Lang said the computer simulation suggests that his team could reach that number in the future.
In general, researchers agree that perovskite solar cells are superior to more traditional silicon-based devices in both space and Earth. From a lunar perspective, the use of perovskite materials is also attractive. This is because it can be kept very thin and reduces the weight of the material transported on the moon. Team estimates that a solar cell with an area of 400 square meters requires only about a kilogram of perovskite. This is an impressive claim, I say Ian Crawford at Birkbeck, University of London.
It is equally important that the regolith does not need to be purified. This means that no special reactor is needed. In fact, Lang says that the large curved mirror and sunlight can create a beam of light that is warm enough to make the mungrass. One of his colleagues has already tested the technology on their university roofs and saw signs of legolith melting, he says.
Nicholas Bennett At the University of Technology, Sydney says that while past research has tried to process the lunar regolith into clear glass, this is the first time that solar cells have been shown to work with fine moonglass instead. The challenge now, he says, is to make a lot of mungrass outside the lab. If successful, such melting techniques could help create other items that the moon base needs, such as tiles, Crawford says.
Michael Duke The Lunar and Planetary Institute states that manufacturing moongrass-based solar cells will require many technological advances, from excavating the legend to connecting individual cells. Still, if a solar plant is established on the moon, there could be a positive knock-on effect. In this future, space-based systems like satellites will need less energy to fire payloads from the moon, allowing solar cells covered in the moon rather than what was created on Earth.
Lang and his colleagues are currently working on increasing the efficiency of solar cells. For example, we know whether choosing iron before using magnets to melt Regolith can improve the quality of mungrass.
Ultimately, they want to expand the process to other dusty residents. “We’re already thinking, ‘Can we make this work on Mars Regolith?”,” says Lang.
Radcliffe’s wave visualization, a series of dust and gas clouds (marked here) throughout the Milky Way. Approximately 400 light years from the sun, marked yellow
Alyssa A. Goodman/Harvard University
Our solar system passed through vast waves of gas and dust about 14 million years ago, darkening the views of the Earth’s night sky. The waves may have left a trace on our planet’s geological records.
Astronomers previously discovered large ocean-like waves of milky stars, gas and dust that ripple up and down for millions of years. One of these closest and most studied is the Radcliffe waves, about 9,000 light years wide and only 400 light years from the solar system.
Now, Efrem Maconi The University of Vienna and his colleagues discovered that the waves of Radcliffe once were far closer to us, surpassing the solar system 11 to 18 million years ago.
Maconi and his team used data from Gaia Space Telescope, which tracked billions of stars in the Milky Way, to identify recently formed groups of stars within the Radcliffe Wave, and identify the dust and gas clouds that formed from them.
Using these stars, they tracked the cloud orbits in time to reveal historic locations to show how the entire wave was moving. They also calculated the past paths of the solar system, rewind the clock for 30 million years, and discovered that the waves and our sun were approaching intimately about 15-12 million years ago. It is difficult to accurately estimate when the intersection began and ended, but the team believes the solar system is within the wave range around 14 million years ago.
This would have made Earth’s galactic environment as dark as it is today, as we currently live in a relatively empty space realm. “If we are in a dense region of interstellar media, that means that the light coming from the stars will dim,” says Macconi. “It’s like being on a foggy day.”
The encounter may have left evidence in Earth’s geological records and deposited radioactive isotopes on the crust, but considering how long ago it happened, this would be difficult to measure, he says. It says it is useful to find such a galactic encounter, as explaining the geological record of the Earth is a continuous problem. Ralph Schoenrich University College London.
More speculatively, the crossing appears to have occurred during a period of cooling, known as the mid-Miocene. Maconi said the two could be linked, but this would be difficult to prove. Schoenrich thinks that is unlikely. “The rule of thumb is that geology outweighs the influence of the universe,” he says. “When you move around the continent or disrupt ocean currents, you need more because climate change is occurring.”
Wolf Rayet 140 (also known as WR 140 or HD 193793) is a system of two massive stars located approximately 5,000 light-years away in the constellation Cygnus. As these stars swing against each other, the stellar winds from each collide, compressing material and forming carbon-rich dust. New observations from the NASA/ESA/CSA James Webb Space Telescope show that 17 dust shells glowing in the mid-infrared are expanding into the surrounding space at regular intervals.
This image of the carbon-rich Wolf-Rayet star WR 140 was taken by the Webb Mid-Infrared Observer (MIRI) in September 2023. Image credits: NASA / ESA / CSA / STScI / E. Lieb, University of Denver / R. Lau, NSF's NOIRLab / J. Hoffman, University of Denver.
“Webb confirmed that Wolf-Rayet 140's dust shell is real,” said Emma Reeve, a doctoral student at the university. “We have shown that there is a visible change in an incredibly short period of time.” Originally from Denver, Colorado.
“All of the shells are moving away from the star at more than 2,600 kilometers per second, which is almost 1% of the speed of light.”
“We're used to thinking of events in the universe as happening slowly over millions or billions of years,” said Jennifer Hoffman, a professor at the University of Denver.
“In this system, the observatory shows that the dust shell is expanding year by year.”
Dr Olivia Jones, an astronomer at the UK Astronomical Technology Center, said: “It's truly amazing to see the real-time movement of these shells during the Webb observations, which were made just 13 months apart.” Ta.
“These new results provide the first glimpse of the potential role of such giant binary stars as dust factories in the universe.”
Like clockwork, the star's winds generate dust for a few months every eight years. The pair approaches each other in a wide and long orbit.
The web also shows where dust stops forming. Look for the dark area in the top left of the image.
The telescope's mid-infrared images detected shells that have survived for more than 130 years. The old shells have dissipated enough that they are now too dark to detect.
Astronomers estimate that a star will eventually produce tens of thousands of dust shells over hundreds of thousands of years.
“The dust in this system is quite cold, so mid-infrared observations are absolutely critical to this analysis,” said Dr. Ryan Lau, an astronomer at the NSF NOIRLab.
“Near-infrared and visible-light observations only show the shells closest to the star.”
“With these amazing new details… findings Published in Astrophysics Journal Letter.
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Emma P. Reeve others. 2025. Dynamic signature of dust formation due to wind impact from WR 140. APJL 979, L3; doi: 10.3847/2041-8213/ad9aa9
Huge Saharan dust plumes carried across the Atlantic by trade winds could influence weather in North America by suppressing the development of hurricanes at sea, but the thick dust plumes could also bring heavy rainfall from storms coming onshore, according to a new study.
Vermilion othersThey found a nonlinear, boomerang-shaped relationship between Saharan dust and tropical cyclone rainfall. Image courtesy of Enrique.
“Surprisingly, the main driver of hurricane precipitation is not sea surface temperature or atmospheric moisture, as previously thought, but rather Saharan dust,” said Dr Yuan Wang of Stanford University.
Previous studies have found that human-induced climate change could dramatically reduce Saharan dust transport and increase hurricane rainfall in the coming decades.
But uncertainties remain about questions such as how climate change will affect dust runoff from the Sahara and how much more rainfall from future hurricanes is expected to occur.
“Hurricanes are among the most destructive weather phenomena on Earth,” Dr Wang said.
“Even relatively weak hurricanes can cause heavy rainfall and flooding hundreds of miles inland.”
“I think dust hasn't received enough attention right now in traditional weather forecasting, especially hurricane forecasting.”
Dust can have opposing effects on tropical cyclones, which are classified as hurricanes in the North Atlantic, central North Pacific, and eastern North Pacific when their maximum sustained winds reach 74 miles per hour or greater.
“The dust particles can make ice clouds more efficient in the centre of the hurricane, potentially resulting in more precipitation,” Dr Wang said.
“Dust can also block solar radiation, lowering sea surface temperatures near the center of a storm and weakening tropical cyclones.”
Dr. Wang and his colleagues set out to first develop a machine learning model that could predict hurricane rainfall, and then to identify the underlying mathematical and physical relationships.
They used 19 years of weather data and hourly satellite precipitation measurements to predict the amount of rainfall from individual hurricanes.
Their findings suggest that a key predictor of rainfall is measuring dust optical thickness, or the amount of light that penetrates the dust plume.
They found a boomerang-shaped relationship in which precipitation increases between dust optical thicknesses of 0.03 and 0.06, then decreases rapidly.
In other words, at higher concentrations, dust goes from enhancing to suppressing rainfall.
“Usually, when the dust loading is low, the microphysical enhancement effect is more pronounced,” Dr Wang said.
“If the dust loading is high, it can shade the ocean surface from sunlight more efficiently, and the so-called 'radiative suppression effect' will dominate.”
a paper A paper describing the findings was published in the journal. Scientific advances.
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Lyin Chew others2024. The primary role of Saharan dust on tropical cyclone rainfall in the Atlantic Basin. Scientific advances 10(30); doi: 10.1126/sciadv.adn6106
This article is a version of a press release provided by Stanford University.
Space dust may have brought elements essential for life to early Earth. Our planet is relatively poor in some of the elements necessary for the chemical reactions of life, but the dust that constantly drifts in from space contains many more, and when the Earth was young it was covered with glaciers. It is possible that they were gathered in
“It’s always been a shadow idea, but people were ignoring it for a number of reasons. The biggest one was that there weren’t enough ideas anywhere,” he said. say. craig walton at Cambridge University. Space dust tends to be rich in elements that are relatively difficult to obtain on Earth, such as phosphorus and sulfur, and it constantly falls in thin layers around the world.
Until now, researchers exploring the origins of such elements on Earth have focused primarily on larger objects that can deliver more elements at once, but such delivery mechanisms were They may have a hard time maintaining their pre-biological chemistry long enough to do so, Walton says. “Meteorites have long been thought to be a great source of these elements, but they release them randomly,” he says. “It’s like if I give you a big feast once, but you never eat again, you’re going to have a hard time living a happy life. You need a continuous source, and that’s what happens. It’s space dust.”
Up to 40,000 tons of space dust falls on Earth every year. Billions of years ago, that number may have been between 10 and 10,000 times higher, but that was still not enough to make individual locations particularly rich in elements important to life. Walton and his colleagues simulated how wind and water move dust and collect it in concentrations high enough to support life.
They found that glaciers are the most promising environment because they have the potential to trap large amounts of dust and are very less contaminated by dirt on land. When space dust falls on a glacier, it absorbs sunlight and heats up, melting and creating tiny holes in the ice. The hole then continues to trap more dust. Finally, the dust chamber flows into a pond at the edge of the glacier.
We can still see this process happening today, but if the Earth had been cold enough to have glaciers billions of years ago, the amount of dust would have increased and it would have been even more efficient. . “If you want to produce deposits that are really rich and have a lot of reactions that could lead to life, this is the best way to do it,” Walton says.
“We don’t know if glaciers were common on early Earth; we just don’t have good data for this period in general,” he says. ben pierce at Johns Hopkins University in Maryland. “But I think it’s worth investigating, especially if it has the potential to provide a mechanism for creating a rich primordial soup.”
The lack of data about conditions on Earth during this time makes it difficult to estimate how important cosmic dust was to the origin of life. “We’ve always had a hard time understanding what the bulk chemistry of early Earth was like,” he says. Matthew Pasek at the University of South Florida. “However, this could be an important source of extremely valuable material.”
NASA’s Stardust mission returned rocky material from the coma of comet 81P/Wild 2 (pronounced “Wild-2”) to Earth on January 15, 2006. Comet Wild 2 contains volatile ice, which may have accreted beyond Neptune’s orbit. The Wild 2 sample was expected to be rich in primordial molecular cloud material, i.e., interstellar and circumstellar particles. Instead, it turns out that Wild 2’s interstellar component is very small, and nearly all of the returned particles formed in a wide and diverse region of the solar nebula. Although some features of the Wild 2 material resemble primitive chondrite meteorites, the diversity of its composition attests to a very different origin and evolutionary history from asteroids. Wild 2 has very little impact debris from asteroids, and may have accreted dust from the outer and inner Solar System before the solar nebula dispersed.
Comet 81P/Wild 2. Image courtesy of NASA.
wild 2 is a small comet in the shape of a flat sphere, approximately 1.65 x 2 x 2.75 km (1.03 x 1.24 x 1.71 miles).
Discovered by Paul Wilde on January 6, 1978, this comet has an orbital period of 6.2 years.
Wild 2 is known as a fresh periodic comet. It orbits the Sun between Mars and Jupiter, but it did not always follow this orbit.
Originally, this comet’s orbit was between the orbits of Uranus and Jupiter. On September 9, 1974, a gravitational interaction between Wild 2 and Jupiter changed its orbital period from her 43 years to her 6.2 years.
“Eighteen years after NASA’s Stardust mission returned the first known sample from a comet to Earth, the true nature of the icy object is coming into focus,” says the new study. said author Ryan Oriol, a researcher at Washington University in St. Louis.
“When Stardust launched in 1999, many scientists predicted that the comet’s rocky material would be dominated by the primordial dust that built our solar system, the ‘stardust’ from which the mission takes its name. I was there.”
“But the actual samples told a different story: Wild 2 contained a potpourri of dust formed from various early events in the solar system’s history.”
For Dr. Oriole, the discovery that Wild 2 contained records of “local” events was exciting.
“This comet was a witness to the events that shaped the solar system into what we see today,” he said.
“Because the comet was kept in a cold storage in space for almost its entire life, it avoided the heat and water alterations seen in asteroid samples.”
“Comet Wild 2 contains things never seen before in a meteorite, including rare carbon and iron assemblages and precursors to the igneous globules that make up the most common type of meteorite. . And all of these objects are beautifully preserved within Wild 2.”
“Almost 20 years later, scientists have had enough time to analyze the tiny amounts of material returned from the Stardust mission, less than a milligram (think a grain of sand). You might see it.”
“But this material is dispersed into thousands of tiny particles on a collector the size of a pizza.”
“Almost every Wild 2 particle is unique and has a different story to tell. Extracting and analyzing these grains is a time-consuming process. But the scientific benefits are huge. .”
“Most of the Wild 2 particles have not yet been studied and certainly hold many more surprises. Over time, we will be able to study the samples using new techniques that did not exist at the start of the mission.” Masu.”
“Stardust samples, microscopic particles taken from celestial bodies less than two miles wide, contain a deep record of the past that spans billions of miles. After 18 years of studying this comet, we have We now have a better understanding of the dynamic formative period.”
study Published in Journal November 2023 issue geochemistry.
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Ryan C. Oriol. 2023. Comet 81P/Wild 2: A record of the solar system’s wild youth. geochemistry 83 (4): 126046; doi: 10.1016/j.chemer.2023.126046
ESA’s PAVER project aimed to create paved surfaces on the lunar surface using melted lunar regolith. They conducted ground-based tests using a carbon dioxide laser and are planning to use a Fresnel lens on the Moon to focus sunlight. The successful use of lasers to melt simulated lunar dust is a significant development in addressing the challenges posed by lunar dust in future missions.
The construction of roads on the lunar surface is essential for astronauts who will likely be driving rather than walking during their missions. Lunar dust is fine, abrasive, and sticky, leading to equipment damage and spacesuit corrosion. For example, the Apollo 17 lunar rover overheated when its rear fender was lost and replaced with a lunar map, covered in kicked-up dust. The Soviet Lunokod 2 rover experienced a similar fate, dying from overheating after its radiator became covered in dust.
To prevent the accumulation of lunar dust, it is necessary to pave active areas on the Moon, including roads and landing pads. The idea of melting sand to create roads was originally proposed in 1933. ESA’s PAVER project, led by Germany’s BAM Institute for Materials Testing in collaboration with Aalen University, LIQUIFER Systems Group, and the University of Claustal in Austria and Germany, investigated the feasibility of building lunar roads using a similar approach. The project received support from the Institute for Space Materials Physics of the German Aerospace Center (DLR).
The PAVER consortium utilized a 12-kilowatt carbon dioxide laser to melt simulated lunar dust and create a glassy solid surface that can serve as a paved surface on the Moon. They achieved spot sizes of 5 to 10 cm in their trials. By utilizing a 4.5 cm diameter laser beam, they developed a strategy to produce a triangular hollow-centered geometry of about 20 cm in diameter. This approach allowed them to create solid surfaces over large areas of lunar soil suitable for roads or landing pads.
The project’s materials engineer, Advenit Makaya, explained that the current laser used in their experiment functions as a light source instead of lunar sunlight. To achieve equivalent melting on the lunar surface, the laser light would be focused using a Fresnel lens with a diameter of several meters.
The PAVER consortium’s methodology involved trial and error to determine the optimal laser beam size and geometry. They found that larger spot sizes were easier to work with, as heating on a millimeter scale produced challenging agglomeration due to surface tension. With their approach, they were able to create a stable layer of molten regolith, which could be better controlled. The resulting material is glassy and brittle but can withstand primarily downward compressive forces, potentially being repaired if needed.
The research team discovered that reheating a cooled track could cause cracks, leading them to minimize crossover in the geometry. The depth of a single melt layer achieved was approximately 1.8 cm. Depending on the required loads, the constructed structures and roads could consist of multiple layers.
The PAVER consortium estimated that a 100 square meter landing pad with a 2 cm thick high-density material could be constructed in 115 days using their approach.
The PAVER project originated from a call for ideas conducted by ESA’s Basic Activities Discovery Division through the Open Space Innovation Platform (OSIP). Out of 69 submissions, 23 ideas were implemented, including the PAVER project. The project has opened up promising avenues for future research in extraterrestrial manufacturing and construction.
Overall, the successful use of lasers to melt lunar dust represents a significant advancement towards the construction of roads and landing pads on the lunar surface, addressing the challenges posed by lunar dust in future lunar missions.
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