"NASA's Ingenuity Mars Helicopter continues to set records, flying faster and farther on Sunday, April 25, 2021 than in any tests it went through on Earth," reports NASA: The helicopter took off at 1:31 a.m. EDT (4:31 a.m. PDT), or 12:33 p.m. local Mars time, rising 16 feet (5 meters) — the same altitude as its second flight. Then it zipped downrange 164 feet (50 meters), almost half the length of a football field, reaching a top speed of 6.6 feet per second (2 meters per second). [Roughly 4.5 miles an hour.]

After data came back from Mars starting at 10:16 a.m. EDT (7:16 a.m. PDT), Ingenuity's team at NASA's Jet Propulsion Laboratory in Southern California was ecstatic to see the helicopter soaring out of view. They're already digging through a trove of information gathered during this third flight that will inform not just additional Ingenuity flights but possible Mars rotorcraft in the future. "Today's flight was what we planned for, and yet it was nothing short of amazing," said Dave Lavery, the project's program executive for Ingenuity Mars Helicopter at NASA Headquarters in Washington. "With this flight, we are demonstrating critical capabilities that will enable the addition of an aerial dimension to future Mars missions."
NASA's chief pilot for the Mars helicopter calls this flight a big step "in which Ingenuity will begin to experience freedom in the sky," according to CNN.

From the sky Ingenuity snapped a photo of its own shadow on Mars, and earlier sent back the very first aerial color image — taken 17 feet (5.2-metre) above the surface of Mars by Ingenuity's high-resolution color camera with a 4208-by-3120-pixel sensor.

The New York Times reports: A major United Nations report will declare that slashing emissions of methane, the main component of natural gas, is far more vital than previously thought... It also says that — unless there is significant deployment of unproven technologies capable of pulling greenhouse gases out of the air — expanding the use of natural gas is incompatible with keeping global warming to 1.5 degrees Celsius, a goal of the international Paris Agreement...

The reason methane would be particularly valuable in the short-term fight against climate change: While methane is an extremely potent greenhouse gas, it is also relatively short-lived, lasting just a decade or so in the atmosphere before breaking down. That means cutting new methane emissions today, and starting to reduce methane concentrations in the atmosphere, could more quickly help the world meet its midcentury targets for fighting global warming. By contrast, carbon dioxide, the main greenhouse gas, lasts for hundreds of years in the atmosphere... While cutting back on carbon dioxide emissions will remain urgent, "it's going to be next to impossible to remove enough carbon dioxide to get any real benefits for the climate in the first half of the century," said Drew Shindell, the study's lead author and a professor of earth science at Duke University. "But if we can make a big enough cut in methane in the next decade, we'll see public health benefits within the decade, and climate benefits within two decades," he said...

Carbon dioxide is the biggest driver of climate change, but methane is more potent in the shorter term, warming the atmosphere more than 80 times as much as the same amount of carbon dioxide does over a 20-year period. That's bad news, but it also means that cutting methane emissions may be one of the most effective ways to immediately slow rising global temperatures... Unlike carbon dioxide or most other air pollution, methane isn't released by burning fossil fuels, but comes from leaks and other releases from oil and gas infrastructure, among other sources... Fixing those leaks in theory should pay for themselves by saving money, because capturing the gas means companies capture more product. That potential makes plugging leaks from oil and gas infrastructure the most effective and cheapest way to slow emissions, the U.N. report says...

Rolling back methane emissions would prevent more than 250,000 premature deaths, and more than 750,000 asthma-related hospital visits, each year from 2030 onward, the report finds. The lower emissions would also prevent more than 70 billion hours of lost labor from extreme heat and more than 25 million tons of crop losses a year.
One professor of ecology and environmental biology at Cornell University tells the Times we've overestimated agriculture's role in methane while underestimating the fuel industry's role, while another researcher found that methane-reduction efforts in the top-polluting industries could slow global warming by 30 percent.

"Over all, a concerted effort to reduce methane from the fossil fuel, waste and agricultural sectors could slash methane emissions by as much as 45 percent by 2030, helping to avoid nearly 0.3 degrees Celsius of global warming as early as the 2040s, the report says."

Technology/space pundit Robert Cringely writes that SpaceX's winning bid on NASA's Artemis lunar lander contract was helped by its flexibility in how it would be paid — made possibly by SpaceX's cushy financial position.

But he believes that's part of a larger story about SpaceX's "steadily crushing its competitors by building a hyper-efficient space ecosystem where the other guys are just building rockets," arguing that SpaceX has already won the global war of ISPs "at a net cost of ZERO dollars," if not a negative net cost, while realizing a dream of a satellite internet service that for 30 years has eluded investors like Bill Gates:

SpaceX making a profit where one would not normally exist comes thanks to U.S. residents who pay telephone and Internet bills. The U.S. Federal Communications Commission (FCC) has been socking-away for a decade about $1.8 billion per year from you and me, saving-up to pay for expansions of rural telephony and broadband. There is now about $16 billion in this federal kitty and the FCC is starting to spend it with telephone and internet service providers, paying them to extend broadband and voice services to remote rural users who are presently underserved or unserved completely. All of this is both perfectly legal and even a good idea. Everybody wins. But circumstances are turning out to indicate that SpaceX is probably winning more than anyone else... So far SpaceX has won auctions for service in parts of 35 states for a total of $885 million... SpaceX just bid for potential customers in places where other companies typically didn't even bother to bid. They took the obvious remote customers and apparently won't be over-charging them or the government, either...

There is no FCC rule saying Comcast couldn't sub-contract...difficult customers to Starlink... Instead of earning $885 million of those FCC subsidies, Starlink is more likely to gain half of the full $9.2 billion — money that can be used for any purpose including financing that Artemis lander. But remember that satellites are a global resource. If SpaceX launches 4000 or 12,000 Starlink satellites to serve the USA, they'll also serve anywhere else the satellites overfly, even North Korea. The same level of service Starlink offers in Omaha will be available in Vietnam or on tankers in the Pacific ocean.

Once Starlink becomes effectively the dominant ISP in America, it will also become the dominant ISP in the world. And all at no cost to SpaceX since the expansion will have been financed from our phone bills.
Cringely cites estimates that 40,000 satellites would be enough to serve every Internet user on Earth, as well as IoT devices and even future as-yet-uninvented network services.

He also asks whether this might ultimately make it harder for China to censor the internet — and whether Apple might attempt a competing satellite-to-phone network, possibly using technology from Samsung.

The massive melting of glaciers as a result of global heating has caused marked shifts in the Earth's axis of rotation since the 1990s, research has shown. It demonstrates the profound impact humans are having on the planet, scientists said. New submitter DickHodgman shares a report: In the past, only natural factors such as ocean currents and the convection of hot rock in the deep Earth contributed to the drifting position of the poles. But the new research shows that since the 1990s, the loss of hundreds of billions of tonnes of ice a year into the oceans resulting from the climate crisis has caused the poles to move in new directions. The scientists found the direction of polar drift shifted from southward to eastward in 1995 and that the average speed of drift from 1995 to 2020 was 17 times faster than from 1981 to 1995. Since 1980, the position of the poles has moved about 4 metres in distance.

An anonymous reader quotes a report from Ars Technica: Extreme weather has become the new normal -- whether it's precipitation, drought, wind, heat, or cold. The question of how the ever-shrinking layer of Arctic sea ice has contributed to any of these changes has prompted some lively discussion over the past few years. Researchers have proposed that a weakened jet stream driven by vanishing Arctic sea ice might play a large role in extreme winter events like the descending polar vortex that struck North America earlier this year. But the idea hasn't held up well in light of more recent evidence.

But now, researchers have identified a direct link between extreme winter weather and sea ice loss. The 2018 "Beast of the East" winter storm hit Europe with record-breaking snowfall and low temperatures. And potentially as much as 88 percent of that snowfall originated from increased evaporation of the Barents Sea.

The working hypothesis is that Arctic sea ice acts as a cap for Arctic waters, limiting evaporation. Less sea ice and warmer Arctic temperatures mean more evaporation, potentially explaining the increased severity of winter storms like the Beast of the East. Until now, it's been tough to measure direct evidence linking sea ice loss to extreme European winters, but recent advances in technology are making this a little less challenging.

NASA's first attempt to fly its "Ingenuity" helicopter on Mars was a success, marking what the space agency says is the first powered, controlled flight by an aircraft on another world. The BBC reports: The space agency is promising more adventurous flights in the days ahead. Ingenuity will be commanded to fly higher and further as engineers seek to test the limits of the technology. The rotorcraft was carried to Mars in the belly of Nasa's Perseverance Rover, which touched down in Jezero Crater on the Red Planet in February.

The demonstration saw the Mars-copter rise to just over 3m, hover, swivel 96 degrees, hover some more, and then set down. In all, it managed almost 40 seconds of flight, from take-off to landing. Getting airborne on the Red Planet is not easy. The atmosphere is very thin, just 1% of the density here at Earth. This gives the blades on a rotorcraft very little to bite into to gain lift. There's help from the lower gravity at Mars, but still -- it takes a lot of work to get up off the ground. Ingenuity was therefore made extremely light and given the power (a peak power of 350 watts) to turn those blades extremely fast - at over 2,500 revolutions per minute for this particular flight. Control was autonomous. The distance to Mars - currently just under 300 million km -- means radio signals take minutes to traverse the intervening space. Flying by joystick is simply out of the question.

Ingenuity has two cameras onboard. A black-and-white camera that points down to the ground, which is used for navigation, and a high-resolution colour camera that looks out to the horizon. Sample navigation images sent back to Earth revealed the helicopter's shadow on the floor of the crater as it came back in to land. Satellites will send home more pictures of the flight over the next day. There was only sufficient bandwidth in the orbiters' first overflight to return a short snatch of video from Perseverance, which was watching and snapping away from a distance of 65m. Longer sequences should become available in due course.

Slashdot reader quonset reminds us that NASA's Mars helicopter "is officially 'go' for flight!," according to the Twitter feed of the Perserverance Rover, which notes that its cameras are ready to film the historic event.

"Watch with the team as they receive data and find out if they were successful," adds NASA's official feed. "Meet us in mission control April 19 at 6:15am ET (10:15am UTC): Data from the first flight will return to Earth a few hours following the autonomous flight. A livestream will begin at 6:15 a.m. EDT (3:15 a.m. PDT), as the helicopter team prepares to receive the data downlink in the Space Flight Operations Facility at NASA's Jet Propulsion Laboratory (JPL). Watch on NASA Television, the agency app, website, and social media platforms, including YouTube and Facebook.

If the flight takes place April 19, a postflight briefing will be held at 2 p.m. EDT (11 a.m. PDT)...

The public and media also may ask questions on social media during the livestream and briefing using #MarsHelicopter. Find the latest schedule updates here.

The Perseverance rover will provide support during flight operations, taking images, collecting environmental data, and hosting the base station that enables the helicopter to communicate with mission controllers on Earth.
Update: And it's a success! "We've been talking for so long about our Wright Brothers moment on Mars, and here it is," said NASA Ingenuity Mars Helicopter project manager MiMi Aung. The Perserverance rover has already tweeted out a choppy video.

The New York Focus site writes: A decade ago, the bankrupt owner of the Greenidge power plant in Dresden, New York, sold the uncompetitive coal-fired relic for scrap and surrendered its operating permits. For the next seven years, the plant sat idle on the western shore of Seneca Lake, a monument to the apparent dead end reached by the state's fossil fuel infrastructure. But today, Greenidge is back up and running as a Bitcoin mining operation. The facility hums with energy-hungry computers that confirm and record Bitcoin transactions, drawing power from the plant's 106-megawatt generator now fueled by natural gas.

The mining activity is exceptionally profitable, thanks to an 800 percent rise in Bitcoin's price since last April. Seeking to ride the boom, the plant's new owners plan to quadruple the power used to process Bitcoin transactions by late next year. Environmental advocates view Greenidge's ambitions, if left unchecked, as an air emissions nightmare. And they fear that dozens of other retired or retiring fossil-fueled power plants across New York could follow Greenidge's example, gaining new life by repurposing as Bitcoin miners or other types of energy-intense data centers.
The New York Times recently touted an alternative to bitcoin mining: the "proof of stake" method, which "instead awards miners new blocks based on how much cryptocurrency they already own." The world's second-largest cryptocurrency by market capitalization, Ethereum, has said it is moving toward proof of stake (that switch is likely to take up to another year). Though some critics say Bitcoin will eventually need to follow, particularly if an environmental backlash grows, there are no current plans to do so and such a move is unpopular within the Bitcoin community.

"That reduces your emissions to almost nothing," said Joseph Pallant, Blockchain for Climate's founder and executive director. Cryptocurrency platforms like Tezos or Near Protocol already use proof of stake and have vastly lowered their energy use.

"Two satellites from the fast-growing constellations of OneWeb and SpaceX's Starlink dodged a dangerously close approach with one another in orbit," reported The Verge, citing representatives from both OneWeb and the U.S. Space Force.

UPDATE (April 22): SpaceX strongly disputes OneWeb's characterization of the event.

Below is the Verge's original report: On March 30th, five days after OneWeb launched its latest batch of 36 satellites from Russia, the company received several "red alerts" from the US Space Force's 18th Space Control Squadron warning of a possible collision with a Starlink satellite. Because OneWeb's constellation operates in higher orbits around Earth, the company's satellites must pass through SpaceX's mesh of Starlink satellites, which orbit at an altitude of roughly 550 km.

One Space Force alert indicated a collision probability of 1.3 percent, with the two satellites coming as close as 190 feet — a dangerously close proximity for satellites in orbit. If satellites collide in orbit, it could cause a cascading disaster that could generate hundreds of pieces of debris and send them on crash courses with other satellites nearby...

Space Force's urgent alerts sent OneWeb engineers scrambling to email SpaceX's Starlink team to coordinate maneuvers that would put the two satellites at safer distances from one another. While coordinating with OneWeb, SpaceX disabled its automated AI-powered collision avoidance system to allow OneWeb to steer its satellite out of the way, according to OneWeb's government affairs chief Chris McLaughlin... SpaceX's automated system for avoiding satellite collisions has sparked controversy, raising concerns from other satellite operators who say they have no way of knowing which way the system will move a Starlink satellite in the event of a close approach.

AmiMoJo shares a report from The Guardian: The whitest-ever paint has been produced by academic researchers, with the aim of boosting the cooling of buildings and tackling the climate crisis. The new paint reflects 98% of sunlight as well as radiating infrared heat through the atmosphere into space. In tests, it cooled surfaces by 4.5C below the ambient temperature, even in strong sunlight. The researchers said the paint could be on the market in one or two years. Currently available reflective white paints are far better than dark roofing materials, but only reflect 80-90% of sunlight and absorb UV light. This means they cannot cool surfaces below ambient temperatures. The new paint does this, leading to less need for air conditioning and the carbon emissions they produce, which are rising rapidly.

The new paint was revealed in a report in the journal ACS Applied Materials & Interfaces. Three factors are responsible for the paint's cooling performance. First, barium sulphate was used as the pigment which, unlike conventional titanium dioxide pigment, does not absorb UV light. Second, a high concentration of pigment was used -- 60%. Third, the pigment particles were of varied size. The amount of light scattered by a particle depends on its size, so using a range scatters more of the light spectrum from the sun. The researchers said the ultra-white paint uses a standard acrylic solvent and could be manufactured like conventional paint. They claim the paint would be similar in price to current paints, with barium sulphate actually cheaper than titanium dioxide. They have also tested the paint's resistance to abrasion, but said longer-term weathering tests were needed to assess its long-term durability.

For the first time, scientists have estimated how many Tyrannosaurus rex, the so-called king of dinosaurs, once roamed the Earth. From a report: The number is staggering: 2.5 billion Tyrannosaurus rex lived and died during the roughly 2.4 million years the species survived on the planet, according to a new study set to be published in the journal Science on Friday. The study may help contextualize the fossil record and the rarity of finding certain fossilized prehistoric organisms, according to lead researcher Charles Marshall, director of the University of California Museum of Paleontology. "I mean, to me, it's just amazing we could have come up with a number," Marshall told Axios. "Some people have asked me, 'How does your number compare to other numbers of the total that have ever lived?' The answer is it doesn't because there weren't any."

California and its partners are set to launch by 2023 two satellites to spot and monitor plumes of planet-warming carbon dioxide (CO2) and methane. "If all goes right, dozens more could follow," reports Science Magazine. From the report: The $100 million Carbon Mapper project, announced today and financed by private philanthropists including Michael Bloomberg, will advance efforts to track concentrated emissions of greenhouse gases, which rise from fossil fuel power plants, leaky pipelines, and abandoned wells. Previous satellites have lacked the resolution and focus to monitor point sources rigorously. [...] The satellites will be built and managed by Planet, a California company that already operates a constellation of Earth-imaging satellites. The spacecraft will rely on "hyperspectral" imaging spectrometers developed by NASA's Jet Propulsion Laboratory (JPL). Rather than gathering light in just a few discrete wavelength channels, like the human eye, these spectrometers capture reflected sunlight and subdivide it into more than 400 wavelength channels across the visible and into the infrared. The intensity of light across these channels can be tied to specific chemistries and reflect the abundances of certain gases in the air molecules below.

The satellites won't just measure gases in the air; they will also detect chemical signatures on the ground. By measuring the intensity of green chlorophyll or detecting the signatures for excess salts or fungus, for example, researchers will be able to evaluate the health of crops and forests. They can prospect for minerals in remote regions. They can map and identify different coral and algae species, and they can track dust and soot. Even snow and ice pops out in these sensors, says Robert Green, a remote-sensing scientist at JPL. "Snow is one of the most colorful materials on Earth if you look beyond visible light."

The first two Carbon Mapper satellites will each be roughly the size of a washing machine, weighing up to 200 kilograms. They will provide imagery with a resolution of 30 meters but won't offer global coverage at first. Instead, they will target regions known to host superemitters, like power plants, oil and gas drilling, or livestock operations. The regions will be revisited every few weeks to start. All emission data, calculated from the plume intensity and length, will be made publicly available -- in the hopes that governments and businesses will do more to staunch leaks and tamp down discharges. [...] Should Carbon Mapper's first two satellites prove successful, Planet envisions building a commercial constellation of similar satellites that would revisit every spot on the planet once a day, and selling those data to regulators and companies.

Apple on Thursday announced it's launching a $200 million "Restore Fund" that will "make investments in forestry projects to remove carbon from the atmosphere while generating a financial return for investors." From a report: The move is the latest step by the world's largest tech companies to invest in climate initiatives, including a number of efforts to finance technologies and methods to not only cut emissions, but remove atmospheric CO2.

Google Earth has partnered with NASA, the U.S. Geological Survey, the EU's Copernicus Climate Change Service, and Carnegie Mellon University's CREATE Lab to bring users time-lapse images of the planet's surface -- 24 million satellite photos taken over 37 years. Together they offer photographic evidence of a planet changing faster than at any time in millennia. Shorelines creep in. Cities blossom. Trees fall. Water reservoirs shrink. Glaciers melt and fracture. From a report: "We can objectively see global warming with our own eyes," said Rebecca Moore, director of Google Earth. "We hope that this can ground everyone in an objective, common understanding of what's actually happening on the planet, and inspire action." Timelapse, the name of the new Google Earth feature, is the largest video on the planet, according to a statement from the company, requiring 2 million hours to process in cloud computers, and the equivalent of 530,000 high-resolution videos. The tool stitches together nearly 50 years of imagery from the U.S.'s Landsat program, which is run by NASA and the USGS. When combined with images from complementary European Sentinel-2 satellites, Landsat provides the equivalent of complete coverage of the Earth's surface every two days. Google Earth is expected to update Timelapse about once a year.

Facebook said Thursday that since 2020, all its operations have been fully supported by renewable energy, hitting a goal the social media giant set in 2018 to combat climate change. From a report: The social network made the announcement ahead of Earth Day, an annual event on April 22 that focuses on environmental protection. The milestone shows what tech firms are doing to offset the harmful impacts they have on the environment as they make new devices and power data centers amid a growing appetite for tech products. For years, environmental groups such as Greenpeace have been putting increasing pressure on businesses like Facebook to become more eco-friendly.

Facebook also said its operations reached "net zero emissions," which the company says means "removing the same amount of greenhouse gas emissions from the atmosphere as we emit." These emissions contribute to some pollution and a warmer climate, according to the US Environmental Protection Agency. The social network said in the last three years, it cut down on its greenhouse gas emissions by 94%, surpassing its 75% reduction goal. Some of the emissions Facebook reduced came from its data centers, offices and other buildings the company leases.

Space.com writes: Tank battles and history will collide this month as the makers of the free-to-play game "World of Tanks" honors the legacy of famed cosmonaut Yuri Gagarin for the 60th anniversary of his historic launch into space... "World of Tanks" developer Wargaming has launched its "To The Stars!" event, which recruits Gagarin into the game along with Vostok 1 themed goodies for players. The event launched Wednesday (April 7 ) and runs through April 19. Gagarin will be an in-game commander, dressed in his iconic orange flight suit, who will represent the U.S.S.R. nation.

"World of Tanks" creators worked with Gagarin's daughter, Galina Gagarina, to launch a commemorative website for the 60th anniversary of Vostok 1. You can see that "To The Stars! website here, where players can also track their progress in the event.

"Yuri Gagarin proved that humans can live and operate in space. His flight encouraged and gave hope to all those who dreamed of this! It kickstarted the deep understanding of humanity's role in preserving and developing our cosmic home — Earth," Galina Gagarin said in a statement. "I'm happy to know that, through the millions-strong audience of World of Tanks, the memory of mankind's first foray into space will be preserved for years to come!"
The press release promises a "shower of cosmic activities," including return of "Gravity Force Mode" between April 12 and April 18 with a new ability that "allows tanks to jump up and operate in the air."

And the Wargaming/MS-1 team behind the mobile tank game "World of Tanks Blitz" commemorated Gagarin's historic flight by launching a tank model into the stratosphere.

Sixty years ago today, Yuri Gagarin became the first human ever in space.

Space.com reports: Because no one was certain how weightlessness would affect a pilot, the spherical capsule had little in the way of onboard controls; the work was done either automatically or from the ground. If an emergency arose, Gagarin was supposed to receive an override code that would allow him to take manual control, but Sergei Korolev, chief designer of the Soviet space program, disregarded protocol and gave the code to the pilot prior to the flight.

Over the course of 108 minutes, Vostok 1 traveled around the Earth once, reaching a maximum height of 203 miles (327 kilometers). The spacecraft carried 10 days' worth of provisions in case the engines failed and Gagarin was required to wait for the orbit to naturally decay. But the supplies were unnecessary. Gagarin re-entered Earth's atmosphere, managing to maintain consciousness as he experienced forces up to eight times the pull of gravity during his descent.
The BBC remembers how on his return to earth, Gagarin parachuted into some farmland several hundred miles from Moscow — "much to the surprise of a five-year-old girl who was out in the fields planting potatoes."

60 years later, the BBC tracked down and interviewed Interviewed that woman — who still remembered Gagarin's kind voice and smile. (Thanks to Slashdot reader 4wdloop for sharing the article.)

The BBC also published a look at Gagarin's global fame in the years that followed — and Phys.org notes that even today, there are few people more universally admired in Russia than Yuri Gagarin: His smiling face adorns murals across the country. He stands, arms at his sides as if zooming into space, on a pedestal 42.5 metres (140 feet) above the traffic flowing on Moscow's Leninsky Avenue. He is even a favourite subject of tattoos... The anniversary of Gagarin's historic flight on April 12, 1961 — celebrated every year in Russia as Cosmonautics Day — sees Russians of all ages lay flowers at monuments to his accomplishment across the country...

Gagarin, says historian Alexander Zheleznyakov, was a figure who helped fuel the imagination. "He transformed us from a simple biological species to one that could imagine an entire universe beyond Earth."

This week Bloomberg profiled "one of the most spectacular failures in modern financial history: No individual has lost so much money so quickly."

Meet Bill Hwang, founder of Archegos Capital Management: Starting in 2013, he parlayed more than $200 million left over from his shuttered hedge fund into a mind-boggling fortune by betting on stocks. Had he folded his hand in early March and cashed in, Hwang, 57, would have stood out among the world's billionaires... At its peak, Hwang's wealth briefly eclipsed $30 billion...

Hwang used swaps, a type of derivative that gives an investor exposure to the gains or losses in an underlying asset without owning it directly. This concealed both his identity and the size of his positions. Even the firms that financed his investments couldn't see the big picture. That's why on Friday, March 26, when investors around the world learned that a company called Archegos had defaulted on loans used to build a staggering $100 billion portfolio, the first question was, "Who on earth is Bill Hwang?"

Because he was using borrowed money and levering up his bets fivefold, Hwang's collapse left a trail of destruction. Banks dumped his holdings, savaging stock prices. Credit Suisse Group AG, one of Hwang's lenders, lost $4.7 billion; several top executives, including the head of investment banking, have been forced out. Nomura Holdings Inc. faces a loss of about $2 billion... On March 25, when Hwang's financiers were finally able to compare notes, it became clear that his trading strategy was strikingly simple. Archegos appears to have plowed most of the money it borrowed into a handful of stocks — ViacomCBS, GSX Techedu, and Shopify among them. This was no arbitrage on collateralized bundles of obscure financial contracts. Hwang invested the Tiger way, using deep fundamental analysis to find promising stocks, and he built a highly concentrated portfolio. The denizens of Reddit's WallStreetBets day trading on Robinhood can do almost the same thing, riding such popular themes as cord cutting, virtual education, and online shopping. Only no brokerage will extend them anywhere near the amount of leverage billionaires get...

People familiar with Archegos say the firm steadily ramped up its leverage. Initially that meant about "2x," or $1 million borrowed for every $1 million of capital. By late March the leverage was 5x or more. Raising money to invest in streaming made sense. Or so it seemed in the ViacomCBS C-suite. Instead, the stock tanked 9% on Tuesday and 23% on Wednesday. Hwang's bets suddenly went haywire, jeopardizing his swap agreements...

Hwang, say people with swaps experience, likely had borrowed roughly $85 million for every $20 million, investing $100 and setting aside $5 to post margin as needed. But the massive portfolio had cratered so quickly that its losses blew through that small buffer as well as his capital.
"The best thing anyone can say about the Archegos collapse is that it didn't spark a market meltdown," the article concludes. "The worst thing is that it was an entirely preventable disaster made possible by Hwang's lenders..."

"Regulators are to blame, too. As Congress was told at hearings following the GameStop Corp. debacle in January, there's not enough transparency in the stock market."

An anonymous reader shares this announcement from NASA: Based on data from the Ingenuity Mars helicopter that arrived late Friday night, NASA has chosen to reschedule the Ingenuity Mars Helicopter's first experimental flight to no earlier than April 14 [this Wednesday].

During a high-speed spin test of the rotors on Friday, the command sequence controlling the test ended early due to a "watchdog" timer expiration. This occurred as it was trying to transition the flight computer from 'Pre-Flight' to 'Flight' mode. The helicopter is safe and healthy and communicated its full telemetry set to Earth.

The watchdog timer oversees the command sequence and alerts the system to any potential issues. It helps the system stay safe by not proceeding if an issue is observed and worked as planned.

The helicopter team is reviewing telemetry to diagnose and understand the issue. Following that, they will reschedule the full-speed test.

"New research has found that previous ice loss events could have caused sea-level rise at rates of around 3.6 meters per century, offering vital clues as to what lies ahead should climate change continue unabated," reports Phys.org: A team of scientists, led by researchers from Durham University, used geological records of past sea levels to shed light on the ice sheets responsible for a rapid pulse of sea-level rise in Earth's recent past. Geological records tell us that, at the end of the last ice age around 14,600 years ago, sea levels rose at ten times the current rate due to Meltwater Pulse 1A (MWP-1A); a 500 year, ~18 meter sea-level rise event... The new study uses detailed geological sea-level data and state-of-the-art modelling techniques to reveal the sources... Interestingly, most of the meltwater appears to have originated from the former North American and Eurasian ice sheets, with minimal contribution from Antarctica, reconciling formerly disparate views...

The results are important for our understanding of ice-ocean-climate interactions which play a significant role in shaping terrestrial weather patterns. The findings are particularly timely with the Greenland ice sheet rapidly melting, contributing to a rise in sea levels and changes to global ocean circulation... Lead author Yucheng Lin, in the Department of Geography at Durham University notes, "The next big question is to work out what triggered the ice melt, and what impact the massive influx of meltwater had on ocean currents in the North Atlantic. This is very much on our minds today — any disruption to the Gulf Stream, for example due to melting of the Greenland Ice Sheet, will have significant consequences for the UK climate."