The Guardian reports that a supermassive black hole discovered at the center of an ancient galaxy "is five times larger than expected for the number of stars it contains, astronomers say." Researchers spotted the immense black hole in a galaxy known as GS-9209 that lies 25bn light-years from Earth, making it one of the most distant to have been observed and recorded. The team at Edinburgh University used the James Webb space telescope (JWST) to observe the galaxy and reveal fresh details about its composition and history. Dr Adam Carnall, who led the effort, said the telescope — the most powerful ever built — showed how galaxies were growing "larger and earlier" than astronomers expected in the first billion years of the universe...

Carnall said the "very massive black hole" at the centre of GS-9209 was a "big surprise" that lent weight to the theory that such enormous black holes are responsible for shutting down star formation in early galaxies. "The evidence we see for the supermassive black hole was really unexpected," said Carnall. "This is the kind of detail we'd never have been able to see without JWST."

An anonymous reader shared this report from the Washington Post: Nearly any material can be used to turn the energy in air humidity into electricity, scientists found in a discovery that could lead to continuously producing clean energy with little pollution. The research, published in a paper in Advanced Materials, builds on 2020 work that first showed energy could be pulled from the moisture in the air using material harvested from bacteria. The new study shows nearly any material can be used, like wood or silicon, as long as it can be smashed into small particles and remade with microscopic pores...

The air-powered generator, known as an "Air-gen," would offer continuous clean electricity since it uses the energy from humidity, which is always present, rather than depending on the sun or wind... The device, the size of a fingernail and thinner than a single hair, is dotted with tiny holes known as nanopores. The holes have a diameter smaller than 100 nanometers, or less than a thousandth of the width of a strand of human hair. The tiny holes allow the water in the air to pass through in a way that would create a charge imbalance in the upper and lower parts of the device, effectively creating a battery that runs continuously. "We are opening up a wide door for harvesting clean electricity from thin air," Xiaomeng Liu, another author and a UMass engineering graduate student, said in a statement.

While one prototype only produces a small amount of energy — almost enough to power a dot of light on a big screen — because of its size, Yao said Air-gens can be stacked on top of each other, potentially with spaces of air in between. Storing the electricity is a separate issue, he added. Yao estimated that roughly 1 billion Air-gens, stacked to be roughly the size of a refrigerator, could produce a kilowatt and partly power a home in ideal conditions. The team hopes to lower both the number of devices needed and the space they take up by making the tool more efficient...

It could be embedded in wall paint in a home, made at a larger scale in unused space in a city or littered throughout an office's hard-to-get-to spaces. And because it can use nearly any material, it could extract less from the environment than other renewable forms of energy. "The entire earth is covered with a thick layer of humidity," Yao said. "It's an enormous source of clean energy. This is just the beginning in making use of that."
More information from the Boston Globe.

Thanks to long-time Slashdot reader SpzToid for sharing the article.

The two Koreas are elevating a space race aimed at modernizing how each country monitors the other's improving military firepower. From a report: As hopes for a diplomatic breakthrough have dimmed in recent years, North and South Korea have grown more antagonistic toward one another and upped their displays of military might. They have traded missile tests. Pyongyang has sent drones that flew over downtown Seoul. South Korea has sharpened security and defense ties with the U.S. and Japan. The rise in tensions has elevated the importance -- and need -- for spy-satellite technology that neither country now has. South Korea cleared a significant technological marker on Thursday, launching multiple commercial satellites aboard a homegrown rocket for the first time. North Korea's Kim Jong Un regime stands poised to soon fly its first military reconnaissance satellite.

Nuri, South Korea's three-stage liquid-fuel rocket, blasted off at 6:24 p.m. local time Thursday from the Naro Space Center in Goheung, a city on the country's southern coast. The 200-ton rocket launched into space and deployed eight satellites into orbit about 342 miles above Earth, about 13 minutes after liftoff. Seoul has the clear technological advantage, weapons analysts say, though Pyongyang has been quick to advance its sanctioned missile program to develop long-range rockets that can carry satellites. Both nations remain years away from having a full-fledged network of spy satellites. But attaining the technology would allow the countries to identify military targets to precisely launch strikes during potential conflict without relying on their allies' satellite technology for information. In North Korea's case, space-based satellite technology is essential for its nuclear strategy. Having eyes in the sky would serve as an additional asset to launching nuclear strikes with better accuracy, said Yang Uk, a military expert at the Asan Institute for Policy Studies, a think tank in Seoul. Should the technology progress enough, North Korea could potentially identify nuclear strike targets in the U.S., he added.

A new SETI project has begun, where a coded message was beamed from Europe's Trace Gas Orbiter Mars probe to Earth and received by three radio telescopes, "kicking off a global effort to decipher the cryptic signal," reports Space.com. From the report: That effort is A Sign in Space, a multiweek project led by Daniela de Paulis, the current artist in residence at the SETI Institute in Mountain View, California and the Green Bank Observatory in West Virginia. "Throughout history, humanity has searched for meaning in powerful and transformative phenomena," de Paulis said in a statement.

"Receiving a message from an extraterrestrial civilization would be a profoundly transformational experience for all humankind," she added. "A Sign in Space offers the unprecedented opportunity to tangibly rehearse and prepare for this scenario through global collaboration, fostering an open-ended search for meaning across all cultures and disciplines."

The Green Bank Observatory is one of the three scopes that listened for the Trace Gas Orbiter's signal today, along with the SETI Institute's Allen Telescope Array in northern California and the Medicina Radio Astronomical Station in northern Italy, which is managed by the Italian National Institute for Astrophysics. Researchers at each of those facilities will now process the signal and make it available to their colleagues around the world and to the public at large. The project team wants folks from a range of backgrounds to study the signal and try their hand at deciphering it. You can learn more about the project, and submit your own ideas about the message, here. There are also workshops available you can attend that discuss the societal implications of detecting a "technosignature" from advanced alien life, among other topics.

An anonymous reader quotes a report from TechCrunch: Commercial Earth-observation companies collect an unprecedented volume of images and data every single day, but purchasing even a single satellite image can be cumbersome and time-intensive. SkyFi, a two-year-old startup, is looking to change that with an app and API that makes ordering a satellite image as easy as a click of a few buttons on a smartphone or computer. SkyFi doesn't build or operate satellites; instead, it partners with over a dozen companies to deliver various kinds of satellite images -- including optical, synthetic aperture radar (SAR), and hyperspectral -- directly to the customer via a web and mobile app. A SkyFi user can task a satellite to capture a specific image or choose from a library of previously captured images. Some of SkyFi's partners include public companies like Satellogic, as well as newer startups like Umbra and Pixxel.

The startup is taking a very 21st-century approach to the Earth observation industry. SkyFi co-founders Bill Perkins and Luke Fischer emphasize that their company is focused on user experience and creating a seamless purchasing process for the consumer, contrasted sharply with what Fischer called "business models based on the '80s and '90s." "We're very customer-focused," Bill Perkins said on the TerraWatch Space podcast. "The industry is science-focused and product-focused."

The startup is targeting three types of customers: individual consumers; large enterprise customers, from verticals spanning agriculture, mining, finance, insurance and more; and U.S. government and defense customers. SkyFi's solution is appealing even these latter customers, who may have plenty of experience working with satellite companies already and could afford the high costs in the traditional marketplace. "Even though we have companies that are multibillion dollar corporations using our platform that could afford to have a multimillion dollar contract year with [any] public satellite company, they're being more cost conscious and that's where this offering of SkyFi comes in," Fischer said. "There is no and will never be a 'contact sales' button on SkyFi," Fischer said. "Because it just was ruining the industry." "I think of SkyFi as the Netflix of the geospatial world, where I think of Umbra, Satellogic and Maxar as the movie studios of the world," Fischer said. "I just want them to produce great content and put it on the platform."

An anonymous reader quotes a report from Ars Technica: SpaceX on Sunday evening launched a commercial mission to the International Space Station carrying four people, including former NASA astronaut Peggy Whitson. This "Axiom-2" mission was commanded by Whitson and carried a paying customer named John Shoffner, who served as pilot, as well as two Saudi Arabian mission specialists, Ali al-Qarni and Rayyanah Barnawi. Shoffner and the government of Saudi Arabia procured the seats on Crew Dragon from Axiom, a Houston-based spaceflight company that brokered the mission to the space station. Whitson is an employee of Axiom. The crew of four is flying the second fully private mission to the International Space Station and will spend about a week on board the orbiting laboratory before departing for Earth -- weather permitting -- on May 30.

The Axiom-2 crew members say they will conduct about 20 scientific experiments while on the station. It is not clear how much of this is legitimate science and how much of it is lip service, but certainly it is beneficial for NASA and other space agencies to gather human performance data from a wide variety of individuals like those on the Axiom-2 flight. Perhaps most significantly, the Axiom missions are expanding the envelope of human spaceflight. By purchasing such flights, these pioneering commercial astronauts are providing funding for the development of new technologies and habitats that should, over time, bring down the cost of access to space and living there.

For SpaceX, this was its 10th human space mission since the Demo-2 flight for NASA that launched in May 2020. In less than three years, the company has now put 38 people into orbit. Of these, 26 were professional astronauts from NASA and its international partners, including Russia; eight were on Axiom missions, and four on Jared Isaacman's Inspiration4 orbital free-flyer mission. Isaacman is due to make a second private flight on board Dragon, Polaris Dawn, later this year. [...] Also on Sunday, for the first time, SpaceX returned a Falcon 9 first stage to a ground-based landing pad near its launch site after a human spaceflight mission. The company was able to do this by squeezing a little bit more performance out of its workhorse rocket, which has now launched more than 230 times. You can watch a recording of the launch here.

New research reveals that New York City is sinking, primarily due to the weight of its tall buildings, exacerbating the threat of flooding from rising sea levels. The Guardian reports: The Big Apple may be the city that never sleeps but it is a city that certainly sinks, subsiding by approximately 1-2mm each year on average, with some areas of New York City plunging at double this rate, according to researchers. This sinking is exacerbating the impact of sea level rise which is accelerating at around twice the global average as the world's glaciers melt away and seawater expands due to global heating. The water that flanks New York City has risen by about 9in, or 22cm, since 1950 and major flooding events from storms could be up to four times more frequent than now by the end of the century due to the combination of sea level rise and hurricanes strengthened by climate change.

This trend is being magnified by the sheer bulk of New York City's built infrastructure. The researchers calculated that the city's structures, which include the famous Empire State Building and Chrysler Building, weigh a total of 1.68tn lbs, which is roughly equivalent to the weight of 140 million elephants. This enormous heft is pushing down on a jumble of different materials found in New York City's ground. While many of the largest buildings are placed upon solid bedrock, such as schist, there is a mixture of other sands and clays that have been build over, adding to a sinking effect that is naturally occurring anyway along much of the US east coast as the land reacts to the retreat of huge glaciers following the end of the last ice age. The research has been published in the journal Earth's Future.

"Astronomers have spotted the largest cosmic explosion ever witnessed, and it's 10 times brighter than any known exploding star, or supernova," reports CNN: The brightness of the explosion, called AT2021lwx, has lasted for three years, while most supernovas are only bright for a few months. The event, still being detected by telescopes, occurred nearly 8 billion light-years away from Earth when the universe was about 6 billion years old. The luminosity of the explosion is also three times brighter than tidal disruption events, when stars fall into supermassive black holes.

But what triggered such a long-lived, massive cosmic explosion? Astronomers said they think a supermassive black hole disrupted a vast gas or dust cloud, potentially thousands of times larger than our sun. It's possible that the cloud was drawn off the course of its orbit and went flying into the black hole, the researchers said. As the black hole swallowed pieces of the hydrogen cloud, shock waves likely reverberated through the cloud's remnants and into the swirling mass of material that orbits around the black hole...

The research team determined that the incredibly luminous event was nearly 100 times brighter than all the 100 billion stars in the Milky Way galaxy combined.
The New York Times calls its "one of the most violent and energetic acts of cosmic cannibalism ever witnessed, perhaps the biggest explosion seen yet in the history of the universe... [A] black hole perhaps a billion times as massive as the sun seems to be gorging on a humongous cloud of gas." "Most supernovae and tidal disruption events only last for a couple of months before fading away," said Philip Wiseman, an astrophysicist at the University of Southampton and the lead author of the new paper [published Thursday in the Monthly Notices of the Royal Astronomical Society]. "For something to be bright for two-plus years was immediately very unusual...."

He added that, with a total radiated energy equal to 100 supernovas, "it is one of the most luminous transients ever discovered." Jolt for jolt, that would put it in the company of colliding black holes. "Black holes colliding release energy in gravitational waves at an extreme luminosity — 10 billion times more 'powerful' than this explosion," Dr. Wiseman wrote. "But that power only lasts for 20 milliseconds," adding that this explosion has lasted years.

"Astronomers have discovered 62 new moons orbiting the ringed planet Saturn," reports Space.com.

So while Jupiter remains the largest planet orbiting our sun — and shaped our solar system with its gravitational bulk — nonetheless the New York Times reports that "the fight over which planet has the most moons in its orbit has swung decisively in Saturn's favor." This month, the International Astronomical Union is set to recognize 62 additional moons of Saturn based on a batch of objects discovered by astronomers. The small objects will give Saturn 145 moons — eclipsing Jupiter's total of 95. "They both have many, many moons," said Scott Sheppard, an astronomer from the Carnegie Institution for Science in Washington, D.C. But Saturn "appears to have significantly more," he said, for reasons that are not entirely understood.

The newly discovered moons of Saturn are nothing like the bright object in Earth's night sky. They are irregularly shaped, like potatoes, and no more than one or two miles across. They orbit far from the planet too, between six million and 18 million miles, compared with larger moons, like Titan, that mostly orbit within a million miles of Saturn. Yet these small irregular moons are fascinating in their own right. They are mostly clumped together in groups, and they may be remnants of larger moons [150 miles across] that shattered while orbiting Saturn. [The article suggests later they may have been destroyed by collisions with other moons, or by impacts from asteroids or comets.]

"These moons are pretty key to understanding some of the big questions about the solar system," said Bonnie Buratti of NASA's Jet Propulsion Laboratory in California and the deputy project scientist on the upcoming Europa Clipper mission to Jupiter. "They have the fingerprints of events that took place in the early solar system."

The growing number of moons also highlights potential debates over what constitutes a moon. "The simple definition of a moon is that it's an object that orbits a planet," Dr. Sheppard said. An object's size, for the moment, doesn't matter.
The leader of one moon-discovering group told the Times there's "potentially thousands" of moons around Saturn and Jupiter.

And at least a few of the moons are circling Saturn in the opposite direction...

Many experts believe fusion power remains decades away. Microsoft thinks it could be just around the corner. From a report: In a deal that is believed to be the first commercial agreement for fusion power, the tech giant has agreed to purchase electricity from startup Helion Energy within about five years. Helion, which is backed by OpenAI founder Sam Altman, committed to start producing electricity through fusion by 2028 and target power generation for Microsoft of at least 50 megawatts after a year or pay financial penalties. The commitment is a bold one given that neither Helion nor anyone else in the world has yet produced electricity from fusion. "We wouldn't enter into this agreement if we were not optimistic that engineering advances are gaining momentum," said Microsoft President Brad Smith.

Fusion powers the sun and stars, and has the potential to provide nearly limitless amounts of carbon-free power if someone can harness it on earth. The International Atomic Energy Agency expects electricity from fusion to be produced in the second half of the century. Helion is building a prototype that it says will demonstrate the ability to produce electricity through fusion next year. "The goal is not to make the world's coolest technology demo," Mr. Altman said in an interview. "The goal is to power the world and to do it extremely cheaply." Mr. Altman, the chief executive officer of OpenAI -- the artificial-intelligence startup behind the viral chatbot ChatGPT -- said having a first customer is critical for keeping Helion grounded in the realities of business, including working with clients, utilities and electric-grid operators.

An anonymous reader shares an excerpt from a Motherboard article: Now, frustrated with a lack of transparency and trust around official accounts of UFO phenomena, a team of developers has decided to take matters into their own hands with an open source citizen science project called Sky360, which aims to blanket the earth in affordable monitoring stations to watch the skies 24/7, and even plans to use AI and machine learning to spot anomalous behavior. Unlike earlier 20th century efforts such as inventors proposing "geomagnetic detectors" to discover nearby UFOs, or more recent software like the short-lived UFO ID project, Sky360 hopes that it can establish a network of autonomously operating surveillance units to gather real-time data of our skies. Citizen-led UFO research is not new. Organizations like MUFON, founded in 1969, have long investigated sightings, while amateur groups like the American Flying Saucer Investigating Committee of Columbus even ran statistical analysis on sightings in the 1960s (finding that most of them happened on Wednesdays). However, Sky360 believes that the level of interest and the technology have now both reached an inflection point, where citizen researchers can actually generate large-scale actionable data for analysis all on their own.

The Sky360 stations consist of an AllSkyCam with a wide angle fish-eye lens and a pan-tilt-focus camera, with the fish-eye camera registering all movement. Underlying software performs an initial rough analysis of these events, and decides whether to activate other sensors -- and if so, the pan-tilt-focus camera zooms in on the object, tracks it, and further analyzes it. According to developer Nikola Galiot, the software is currently based on a computer vision "background subtraction" algorithm that detects any motion in the frame compared to previous frames captured; anything that moves is then tracked as long as possible and then automatically classified. The idea is that the more data these monitoring stations acquire, the better the classification will be. There are a combination of AI models under the hood, and the system is built using the open-source TensorFlow machine learning platform so it can be deployed on almost any computer. Next, the all-volunteer team wants to create a single algorithm capable of detection, tracking and classification all in one.

All the hardware components, from the cameras to passive radar and temperature gauges, can be bought cheaply and off-the-shelf worldwide -- with the ultimate goal of finding the most effective combinations for the lowest price. Schematics, blueprints, and suggested equipment are all available on the Sky360 site and interested parties are encouraged to join the project's Discord server. There are currently 20 stations set up across the world, from the USA to Canada to more remote regions like the Azores in the middle of the Atlantic [...] Once enough of the Sky360 stations have been deployed, the next step is to work towards real-time monitoring, drawing all the data together, and analyzing it. By striving to create a huge, open, transparent network, anyone would be free to examine the data themselves.

In June of this year, Sky360, which has a team of 30 volunteer developers working on the software, hopes to release its first developer-oriented open source build. At its heart is a component called 'SimpleTracker', which receives images frame by frame from the cameras, auto-adjusting parameters to get the best picture possible. The component determines whether something in the frame is moving, and if so, another analysis is performed, where a machine learning algorithm trained on the trajectories of normal flying objects like planes, birds, or insects, attempts to classify the object based on its movement. If it seems anomalous, it's flagged for further investigation.

Slashdot reader Bruce66423 shared this report from LiveScience: Cosmic rays and lasers have revealed that deep underneath the city streets of Naples, Italy, lie the remains of the Greeks who originally settled the area, as well as the catacombs of Christians who lived there during the Roman era nearly two millennia ago, a new study finds...

The layers of contemporary buildings make it difficult to access ancient sewers, cisterns and tombs 33 feet (10 meters) underneath the streets, so a group of Italian and Japanese researchers hypothesized that they could identify previously unknown burial hypogea from the Hellenistic period using 21st-century techniques. Their study, published April 3 in the journal Scientific Reports, details how they used muography to detect underground voids that were unknown to archaeologists... In 1936, scientists discovered that muons are produced by cosmic rays in Earth's atmosphere, and that these tiny particles can easily penetrate walls and rocks, scattering in open spaces. In this study, the muons' tracks were recorded using nuclear emulsion technology, in which extremely sensitive photographic film is used to capture and visualize the paths of the charged particles.

By measuring muon flux — how many muons arrive in a particular area over time — and direction using a particle detector, researchers can peer into volcanoes, underground cavities and even the Egyptian pyramids through muography... Valeri Tioukov, a physicist at Italy's National Institute for Nuclear Physics, and his colleagues placed the muon tracking devices 59 feet (18 m) underground, in a 19th-century cellar that was used for aging ham, where they recorded the muon flux for 28 days, capturing about 10 million muons... 3D laser scans of the accessible structures can then be compared with the measured muon flux. Anomalies in the muon flux images that are not visible in the 3D model can be confidently assumed to be hidden or unknown cavities.

Muography revealed an excess of muons in the data that can be explained only by the presence of a new burial chamber. The chamber's area measures roughly 6.5 by 11.5 feet (2 by 3.5 m), according to the study, and its rectangular shape indicates it is human-made rather than natural.

An anonymous reader shared this report from CNN: Ocean surface heat is at record-breaking levels. Temperatures began climbing in mid-March and skyrocketed over the course of several weeks, leaving scientists scrambling to figure out exactly why.

Temperatures have fallen since their peak in April — as they naturally do in the spring — but they are still higher than they have ever been on record for this time of year.... The record may not seem huge — it's nearly two-tenths of a degree higher than the previous record in 2016 — but given how much heat is needed to warm up this huge body of water, "it's a massive amount of energy," Matthew England, professor of ocean and climate dynamics at the University of New South Wales, Australia, told CNN... Some scientists are concerned the scale of these new records could mark the start of an alarming trend. Others say record-breaking temperatures like these are always concerning but to be expected given the human-caused climate crisis.

All agree the consequences are likely to be significant. Warmer oceans bleach coral, kill marine life, increase sea level rise and make the ocean less efficient at absorbing planet-warming pollution — the warmer oceans get, the more the planet will heat.
The science leader at the British Antarctic Survey told CNN that "it's probably too early" to blame El Niño." In fact, the world just emerged from a 3-year La Niña cooling event in March. So instead, CNN gets a different explanation fro Gregory C. Johnson, an oceanographer at the National Oceanic and Atmospheric Administration: "It's a little bit like we've had the freezer door open for a while and it's helped to cool the planet," Johnson said. But even while that freezer has been open, background temperatures have continued to rise. Now the freezer is closed, everything is hotter than before.
Later CNN adds that some scientists are concerned "climate change might be progressing in ways climate models have not predicted." One surprising reason could be the reduction of aerosols in the atmosphere. In 2020, regulations were introduced to limit the amount of sulfur in the fuel ships used — a policy aimed at addressing air pollution. Though air pollution has a significant impact on human health, it also acts as an artificial sunscreen and reflects sunlight away from the Earth. One theory is the absence of aerosols may have turned up the heat, said Karina von Schuckmann [an oceanographer at Mercator Ocean International in France].

For the first time, astronomers have observed a star swallowing a planet. The findings have been published in the journal Nature. MIT News reports: The planetary demise appears to have taken place in our own galaxy, some 12,000 light-years away, near the eagle-like constellation Aquila. There, astronomers spotted an outburst from a star that became more than 100 times brighter over just 10 days, before quickly fading away. Curiously, this white-hot flash was followed by a colder, longer-lasting signal. This combination, the scientists deduced, could only have been produced by one event: a star engulfing a nearby planet.

What of the planet that perished? The scientists estimate that it was likely a hot, Jupiter-sized world that spiraled close, then was pulled into the dying star's atmosphere, and, finally, into its core. A similar fate will befall the Earth, though not for another 5 billion years, when the sun is expected to burn out, and burn up the solar system's inner planets. "For decades, we've been able to see the before and after," says lead author Kishalay De, a postdoc in MIT's Kavli Institute for Astrophysics and Space Research. "Before, when the planets are still orbiting very close to their star, and after, when a planet has already been engulfed, and the star is giant. What we were missing was catching the star in the act, where you have a planet undergoing this fate in real-time. That's what makes this discovery really exciting."

Eric Berger writes via Ars Technica: A consortium of nearly every major European satellite company announced Tuesday that it plans to bid for a proposed satellite constellation to provide global communications. Essentially, such a constellation would provide the European Union with connectivity from low-Earth orbit similar to what SpaceX's Starlink offers. The bid, which includes large players such as Airbus Defence and Space, Eutelsat, SES, and Thales Alenia Space, comes in response to a request by the European Union for help in constructing a sovereign constellation to provide secure communications for government services, including military applications.

European Union Commissioner Thierry Breton announced the continent's plans for this constellation -- known as Infrastructure for Resilience, Interconnectivity and Security by Satellite, or IRIS^2 -- last November. The European Union will provide 2.4 billion euro, with additional contributions expected from the European Space Agency and private investments. "IRIS^2 establishes space as a vector of our European autonomy, a vector of connectivity and a vector of resilience," Breton said at the time. "It heightens Europe's role as a true space power. With a clear ambition and sense of direction."

The partnership announced Tuesday, which also includes Deutsche Telekom, Hispasat, OHB, Orange, Hisdesat, and Telespazio, will aim to create a state-of-the-art satellite constellation based on a multi-orbit architecture. Although it is top-heavy with established industry players, the partnership said it will encourage startups in the European space sector to join the coalition. This is in response to a desire by Breton to broaden the European commercial space sector. At present, Europe estimates the cost of this constellation at about 6 billion euro and desires it to be ready to provide global coverage by the year 2027.

The James Webb Space Telescope (JWST) has detected water vapor around a distant rocky planet located 26 light-years away. "The water vapor could indicate the presence of an atmosphere around the extrasolar planet, or exoplanet, a discovery that could be important for our search for habitable worlds outside the solar system," reports Space.com. "However, the scientists behind the discovery caution that this water vapor could be coming from the world's host star rather than the planet itself." From the report: The exoplanet, designated GJ 486 b, orbits a red dwarf star located 26 light-years away in the Virgo constellation. Although it has three times the mass of Earth, it is less than a third the size of our planet. GJ 486 b takes less than 1.5 Earth days to orbit its star and is probably tidally locked to the red dwarf, meaning it perpetually shows the same face to its star.

Red dwarfs like the parent star of GJ 486 b are the most common form of stars in the cosmos, meaning that statistically speaking, rocky exoplanets are most likely to be found orbiting such a stellar object. Red dwarf stars are also cooler than other types of stars, meaning that a planet must orbit them tightly to remain warm enough to host liquid water, a vital element needed for life. But, red dwarfs also emit violent and powerful ultraviolet and X-ray radiation when they are young that would blast away the atmospheres of planets that are too close, potentially making those exoplanets very inhospitable to life.

That means astronomers are currently keen to discover if a rocky planet in such a harsh environment could manage to both form an atmosphere and then hang on to it long enough for life to take hold, a process that took around a billion years on Earth. [...] Even though GJ 486 b's host star is cooler than the sun, water vapor could still concentrate in starspots. If that is the case, this could create a signal that mimics a planetary atmosphere. If there is an atmosphere around GJ 486 b, then radiation from its red dwarf parent star will constantly erode it, meaning it has to be replenished by steam from the exoplanet's interior ejected by volcanic activity. The research appears in a paper on arXiv while it awaits publication in the journal Astrophysical Journal Letters. You can read more about it via NASA.

The number of known mountains in Earth's oceans has roughly doubled. Global satellite observations have revealed nearly 20,000 previously unknown seamounts, researchers report in the April Earth and Space Science. From a report: Just as mountains tower over Earth's surface, seamounts also rise above the ocean floor. The tallest mountain on Earth, as measured from base to peak, is Mauna Kea, which is part of the Hawaiian-Emperor Seamount Chain. These underwater edifices are often hot spots of marine biodiversity. That's in part because their craggy walls -- formed from volcanic activity -- provide a plethora of habitats. Seamounts also promote upwelling of nutrient-rich water, which distributes beneficial compounds like nitrates and phosphates throughout the water column. They're like "stirring rods in the ocean," says David Sandwell, a geophysicist at the Scripps Institution of Oceanography at the University of California, San Diego.

More than 24,600 seamounts have been previously mapped. One common way of finding these hidden mountains is to ping the seafloor with sonar. But that's an expensive, time-intensive process that requires a ship. Only about 20 percent of the ocean has been mapped that way, says Scripps earth scientist Julie Gevorgian. "There are a lot of gaps." So Gevorgian, Sandwell and their colleagues turned to satellite observations, which provide global coverage of the world's oceans, to take a census of seamounts. The team pored over satellite measurements of the height of the sea surface. The researchers looked for centimeter-scale bumps caused by the gravitational influence of a seamount. Because rock is denser than water, the presence of a seamount slightly changes the Earth's gravitational field at that spot. "There's an extra gravitational attraction," Sandwell says, that causes water to pile up above the seamount.

The Boston Globe reports on a 25-person startup pursuing an unusual solution to the problem of space junk: "Imagine if every car we ever created was just left on the road," said aerospace entrepreneur Jeromy Grimmett. "That's what we're doing in space." Grimmett's tiny company, Rogue Space Systems Corp., has devised a daring solution. It's building "orbots" — satellites with robotic arms that can fly right up to a disabled satellite and fix it. Or these orbots could use their arms to collect orbiting rubble left behind by hundreds of previous launches — dangerous junk that's become a hazard to celestial navigation...

Rogue Space aims to catch up fast, with help from Small Business Technology Transfer funds from the SpaceWERX Orbital Prime initiative. Created by the U.S. Space Force, Orbital Prime seeks to build up U.S. private-sector firms that can protect national security by maintaining military satellites and clearing hazardous space debris.
Its first 10-pound, proof-of-concept satellite will launch later this year, the article points out, "to test sensors and software to confirm the system can identify and track other satellites." But "the real excitement will begin later this year" when the company launches a prototype that's four times larger that will "use maneuvering thrusters to test the extremely precise navigation needed to approach a satellite."

And then in late 2024 or early 2025 the company will launch its 660-pound satellite "with robotic arms for fixing other satellites or for dragging debris to a lower orbit, where it will fall back to Earth."

The Associated Press reports that "water may be more widespread and recent on Mars than previously thought, based on observations of Martian sand dunes by China's rover." A paper published in Science suggests thin films of water appeared on sand dunes sometime between 1.4 million years ago and as recently as 400,000 years ago — or perhaps even sooner: The finding highlights new, potentially fertile areas in the warmer regions of Mars where conditions might be suitable for life to exist, though more study is needed...

Before the Zhurong rover fell silent, it observed salt-rich dunes with cracks and crusts, which researchers said likely were mixed with melting morning frost or snow as recently as a few hundred thousand years ago... Conditions during that period were similar to now on Mars, with rivers and lakes dried up and no longer flowing as they did billions of years earlier...

The rover did not directly detect any water in the form of frost or ice. But Qin said computer simulations and observations by other spacecraft at Mars indicate that even nowadays at certain times of year, conditions could be suitable for water to appear... Small pockets of water from thawing frost or snow, mixed with salt, likely resulted in the small cracks, hard crusty surfaces, loose particles and other dune features like depressions and ridges, the Chinese scientists said.
Space.com explains exactly how the discovery was confirmed: The laser-induced breakdown spectrometer (MarSCoDe) instrument onboard the rover zapped sand grains into millimeter-sized particles. Their chemical makeup revealed hydrated minerals like sulfates, silica, iron oxide and chlorides... Researchers say water vapor traveled from Martian poles to lower latitudes like Zhurong's spot a few million years ago, when the planet's polar ice caps released high amounts of water vapor, thanks to a different tilt that had Mars' poles pointed more directly toward the sun. Frigid temperatures on the wobbling planet condensed the drifting vapor and dropped it as snow far from the poles, according to the latest study.

Mars' tilt changes over a 124,000-year cycle, so "this offers a replenishing mechanism for vapor in the atmosphere to form frost or snow at low latitudes where the Zhurong rover has landed," Qin told Space.com. But "no water ice was detected by any instrument on the Zhurong rover." Instead, in the same way that salting roads on Earth melts icy patches during storms, salts in Martian sand dunes warmed the fallen snow and thawed it enough to form saltwater. The process also formed minerals such as silica and ferric oxides, which Zhurong spotted, researchers say. The saltwater, however, didn't stay around for long. Temperatures on Mars swing wildly and spike in the mornings between 5 a.m. and 6 a.m., so the saltwater evaporated and left behind salt and other newly formed minerals that later seeped between the dune's sand grains, cementing them to form a crust, according to the study...

"The phenomenon was documented at one site, but it should be applicable to a fairly large fraction of Mars' surface at similar latitudes," Manasvi Lingam, an assistant professor of astrobiology at the Florida Institute of Technology who wasn't involved in the new research, told Space.com.
Since the rover found water activity on (and in) salty Martian dunes, the researchers now suggest future missions search for salt-tolerant microbes , and are raising the possibility of "extant life on Mars."

"Earth's magnetic environment is filled with a symphony of sound that we cannot hear," NASA wrote this month. When solar winds approach earth, "it causes the magnetic field lines and plasma around Earth to vibrate like the plucked strings of a harp, producing ultralow-frequency waves... a cacophonous operetta portraying the dramatic relationship between Earth and the Sun."

So NASA is now announcing "a new NASA-funded citizen science project called HARP — or Heliophysics Audified: Resonances in Plasmas " that has "turned those once-unheard waves into audible whistles, crunches, and whooshes..." Or, as the Washington Post puts it, "NASA wants your help listening in on the universe."

From NASA's news release: In 2007, NASA launched five satellites to fly through Earth's magnetic "harp" — its magnetosphere — as part of the THEMIS mission (Time History of Events and Macroscale Interactions during Substorms). Since then, THEMIS has been gathering a bounty of information about plasma waves across Earth's magnetosphere. "THEMIS can sample the whole harp," said Michael Hartinger, a heliophysicist at the Space Science Institute in Colorado. "And it's been out there a long time, so it has collected a lot of data."

The frequencies of the waves THEMIS measures are too low for our ears to hear, however. So the HARP team sped them up to convert them to sound waves. By using an interactive tool developed by the team, you can listen to these waves and pick out interesting features you hear in the sounds... Preliminary investigations with HARP have already started revealing unexpected features, such as what the team calls a "reverse harp" — frequencies changing in the opposite way than what scientists anticipated...

"Data sonification provides human beings with an opportunity to appreciate the naturally occurring music of the cosmos," said Robert Alexander, a HARP team member from Auralab Technologies in Michigan. "We're hearing sounds that are literally out of this world, and for me that's the next best thing to floating in a spacesuit."

To start exploring these sounds, visit the HARP website.
"Think listening to years' worth of wave patterns is a job for artificial intelligence? Think again," writes the Washington Post. In a news release, HARP team member Martin Archer of Imperial College London says humans are often better at listening than machines. "The human sense of hearing is an amazing tool," Archer says. "We're essentially trained from birth to recognize patterns and pick out different sound sources. We can innately do some pretty crazy analysis that outperforms even some of our most advanced computer algorithms."