Long-time Slashdot reader jrronimo says JILA physicist Jun Ye's group "has made a breakthrough towards the next stage of precision timekeeping."

From their paper recently published to arXiv: Optical atomic clocks use electronic energy levels to precisely keep track of time. A clock based on nuclear energy levels promises a next-generation platform for precision metrology and fundamental physics studies.... These results mark the start of nuclear-based solid-state optical clocks and demonstrate the first comparison of nuclear and atomic clocks for fundamental physics studies. This work represents a confluence of precision metrology, ultrafast strong field physics, nuclear physics, and fundamental physics.

Lego teamed up with the European Space Agency to make Lego pieces from actual meteorite dust, writes Engadget.

"It's a proof of concept to show how astronauts could use moondust to build lunar structures." Consider the sheer amount of energy and money required to haul up building materials from Earth to the Moon. It would be a game changer to, instead, build everything from pre-existing lunar materials. There's a layer of rock and mineral deposits at the surface of the Moon, which is called lunar regolith...

However, there isn't too much lunar regolith here on Earth for folks to experiment with. ESA scientists made their own regolith by grinding up a really old meteorite. [4.5 billion years, according to Lego's site, discovered in Africa in 2000.] The dust from this meteorite was turned into a mixture that was used to 3D print the Lego pieces. Voila. Moon bricks. They click together just like regular Lego bricks, though they only come in one color (space gray obviously.)
"The result is amazing," says ESA Science Officer Aidan Cowley on the Lego site (though "the bricks may look a little rougher than usual. Importantly the clutch power still works, enabling us to play and test our designs.")

"Nobody has built a structure on the Moon," Cowley said in an ESA statement. "So it was great to have the flexibility to try out all kinds of designs and building techniques with our space bricks." And the bricks will also be "helping to inspire the next generation of space engineers," according to the ESA's announcement — since they'll be on display in select Lego stores in the U.S., Canada, the U.K., Spain, France, Germany, the Netherlands, and Australia through September 20th.

"Stars very close to the center of our galaxy could be fueled by dark matter in perpetuity," writes Gizmodo, "according to a team of astronomers who recently studied the distant light sources." The group of stars, known as S-cluster stars, is just three light-years from the center of the Milky Way (for reference, we are about 26,000 light-years from the center of our galaxy, which hosts a supermassive black hole at its core). The stars are surprisingly young for their galactic neighborhood, yet they don't look like stars that simply migrated to this part of the Milky Way after forming in another location...

As reported by Space.com, the research team posits that these weird stars may be accreting dark matter, which they then use as fuel to keep burning. Since models estimate there is plenty of dark matter near the galaxy's core, the stars are "forever young," as study lead author Isabelle John, an astrophysicist at the Kavli Institute for Particle Astrophysics and Cosmology told Space.com. Effectively, the stars have a long, long way to go before they start running low on fuel. The team's paper is currently hosted on the preprint server arXiv, meaning it has not yet gone through the process of peer review.
Dark matter is only "seen" through its effects on other objects, the article points out — leading to lots of theories as to where it's actually located. "Earlier this year, a different team of researchers proposed that neutron stars — extremely dense stellar remnants — could actually be a source of dark matter. Last July, yet another team suggested that the Webb Telescope had detected stars that were powered by dark matter."

An anonymous reader shares a report: Bill Gates has defended the rapid rise in energy use caused by AI systems, arguing the technology would ultimately offset its heavy consumption of electricity. Speaking in London, Gates urged environmentalists and governments to "not go overboard" on concerns about the huge amounts of power required to run new generative AI systems, as Big Tech companies such as Microsoft race to invest tens of billions of dollars in vast new data centres.

Data centres will drive a rise in global electricity usage of between 2-6 per cent, the billionaire said. "The question is, will AI accelerate a more than 6 per cent reduction? And the answer is: certainly," said Gates, the Microsoft co-founder who has been a prolific investor in companies developing sustainable energy and carbon- reduction technologies. In May, Microsoft admitted that its greenhouse gas emissions had risen by almost a third since 2020, in large part due to the construction of data centres.

Gates, who left Microsoft's board in 2020 but remains an adviser to chief executive Satya Nadella, said tech companies would pay a "green premium" -- or higher price -- for clean energy as they seek new sources of power, which was helping to drive its development and deployment. "The tech companies are the people willing to pay a premium and to help bootstrap green energy capacity," he said at the Breakthrough Energy Summit in London on Thursday.

Longtime Slashdot reader thephydes writes: NASA Jet Propulsion Laboratory (JPL) has announced that the SHERLOC (Scanning Habitable Environments with Raman & Luminescence for Organics and Chemicals) instrument on the Perseverance rover has been brought back online "Six months of running diagnostics, testing, imagery and data analysis, troubleshooting, and retesting couldn't come with a better conclusion," said SHERLOC principal investigator Kevin Hand of JPL.

JPL writes in a press release. "Mounted on the rover's robotic arm, SHERLOC uses cameras, spectrometers, and a laser to search for organics and minerals that have been altered by watery environments and may be signs of past microbial life." In addition to its black-and-white context camera, SHERLOC is assisted by WATSON, a color camera for taking close-up images of rock grains and surface textures. The instrument stopped working this past January when it encountered an issue where the "movable lens cover designed to protect the instrument's spectrometer and one of its cameras from dust became frozen in a position that prevented SHERLOC from collecting data," says JPL.

"Analysis by the SHERLOC team pointed to the malfunction of a small motor responsible for moving the protective lens cover as well as adjusting focus for the spectrometer and the Autofocus and Context Imager (ACI) camera. By testing potential solutions on a duplicate SHERLOC instrument at JPL, the team began a long, meticulous evaluation process to see if, and how, the lens cover could be moved into the open position."

A study from the National Institutes of Health (NIH) analyzed data from nearly 400,000 healthy adults over 20 years and determined that "multivitamin use to improve longevity is not supported." The findings were published in JAMA Network Open. ABC News reports: The study found no evidence that daily multivitamin consumption reduced the risk of death from conditions such as heart disease or cancer. Rather than living longer, otherwise healthy people who took daily multivitamins were slightly more likely (4%) than non-users to die in the study period, according to researchers. Researchers reported nearly 165,000 deaths occurring during the follow-up period of the study, out of the initial group of 390,000 participants. The study, however, did not analyze data from people with pre-existing vitamin deficiencies. "What this study shows is that, generally, multivitamins aren't going to help you live longer," Dr. Jade A Cobern, MD, MPH, board-certified physician in pediatrics and general preventive medicine, told ABC News. "Even though the cost of many multivitamins isn't high, this is still an expense that many people can be spared from."

An anonymous reader quotes a report from The Guardian: Ultra-processed foods (UPFs) are displacing healthy diets "all over the world" despite growing evidence of the risks they pose and should be sold with tobacco-style warnings, according to the nutritional scientist who first coined the term. Prof Carlos Monteiro of the University of Sao Paulo will highlight the increasing danger UPFs present to children and adults at the International Congress on Obesity this week. "UPFs are increasing their share in and domination of global diets, despite the risk they represent to health in terms of increasing the risk of multiple chronic diseases," Monteiro told the Guardian ahead of the conference in Sao Paulo. "UPFs are displacing healthier, less processed foods all over the world, and also causing a deterioration in diet quality due to their several harmful attributes. Together, these foods are driving the pandemic of obesity and other diet-related chronic diseases, such as diabetes."

Monteiro and his colleagues first used the phrase UPF 15 years ago when designing the food classification system "Nova." This assesses not only nutritional content but also the processes food undergoes before it is consumed. The system places food and drink into four groups: minimally processed food, processed culinary ingredients, processed food and ultra-processed food. Monteiro told the Guardian he was now so concerned about the impact UPF was having on human health that studies and reviews were no longer sufficient to warn the public of the health hazards. "Public health campaigns are needed like those against tobacco to curb the dangers of UPFs," he told the Guardian in an email. "Such campaigns would include the health dangers of consumption of UPFs. Advertisements for UPFs should also be banned or heavily restricted, and front-of-pack warnings should be introduced similar to those used for cigarette packs."

He will tell delegates: "Sales of UPFs in schools and health facilities should be banned, and there should be heavy taxation of UPFs, with the revenue generated used to subsidize fresh foods." Monteiro will tell the conference that food giants marketing UPFs know that, in order to be competitive, their products must be more convenient, more affordable and tastier than freshly prepared meals. "To maximize profits, these UPFs must have lower cost of production and be overconsumed," he said. He will also draw parallels between UPF and tobacco companies. "Both tobacco and UPFs cause numerous serious illnesses and premature mortality; both are produced by transnational corporations that invest the enormous profits they obtain with their attractive/addictive products in aggressive marketing strategies, and in lobbying against regulation; and both are pathogenic (dangerous) by design, so reformulation is not a solution."

An anonymous reader shares a report: A top executive at McDonald's says the chain does not have plans to bring back plant-based options after a test of its McPlant burger in San Francisco and Dallas failed. "It was not successful in either market," Joe Erlinger, McDonald's U.S. president, said during the Wall Street Journal Global Food Forum in Chicago on Wednesday.

American consumers are not coming to McDonald's looking for a McPlant burger or other plant-based proteins, Erlinger added. The chain had previously partnered with Beyond Meat to make McPlant burgers and nuggets. Plant-based items are off the menu for now, but Erlinger didn't rule out the possibility that salads could one day make a return. That'll depend on whether customer demand is there.

"If people really want salads from McDonald's, we will gladly relaunch salads," Erlinger said. "But what our experience has proven is that's not what the consumer is looking for from McDonald's." Instead, consumers are looking for french fries, $5 meal deals, and hot, fresh sandwiches, he added.

Nine astronauts aboard the International Space Station were forced to take shelter late Wednesday when a satellite broke up in low Earth orbit. This "debris-generating event" created "over 100 pieces of trackable [space junk]," according to U.S. space-tracking firm LeoLabs. Space.com reports: The Expedition 71 crew on the International Space Station (ISS) went to their three spacecraft, including Boeing Starliner, shortly after 9 p.m. EDT (0200 GMT), according to a brief NASA update on X, formerly known as Twitter. As the ISS follows a time zone identical to GMT, according to the European Space Agency, the astronauts were likely in their sleep period when the incident occurred. The procedure was a "precautionary measure", NASA officials added, stating that the crew only stayed in their spacecraft for about an hour before they were "cleared to exit their spacecraft, and the station resumed normal operations."

NASA did not specify which satellite was associated with the incident, but satellite monitoring and collision detection firm LeoLabs identified a "debris-generating event" that same evening. "Early indications are that a non-operational Russian spacecraft, Resurs-P1 [or] SATNO 39186, released a number of fragments," the company wrote on X. U.S. Space Command also reported the Resurs-P1 event, saying on X that over 100 pieces of trackable debris were generated. The military said it "observed no immediate threats and is continuing to conduct routine conjunction assessments." (A conjunction refers to a close approach of two objects in orbit to one another.)

Scientists have uncovered a new gene-editing tool with potential to rival CRISPR, according to studies published in Nature on Wednesday. The system, based on a bacterial DNA parasite called IS110, uses RNA guides to target specific genomic locations. While showing promise for precise DNA cutting, the method currently lacks the accuracy needed for human applications. At best, it achieved 94% accuracy in lab tests. The team also revealed the molecular structure of IS110's DNA-cutting enzyme, shedding light on its unique four-step editing mechanism.

Nature, 2024. DOI: 10.1038/s41586-024-07552-4, 10.1038/s41586-024-07570-2.

The number of climate lawsuits filed against companies around the world is rising swiftly, a report has found, and a majority of cases that have concluded have been successful. From a report: About 230 climate-aligned lawsuits have been filed against corporations and trade associations since 2015, two-thirds of which have been initiated since 2020, according to the analysis published on Thursday by the Grantham Research Institute on Climate Change and the Environment. One of the most rapidly growing forms of litigation is over "climate-washing" -- when companies are accused of misrepresenting their progress towards environmental targets -- and the analysis found that 47 such cases were filed against companies and governments in 2023.

As climate communications are increasingly scrutinised, there has been arise in climate-washing litigation, often with positive outcomes for those bringing the cases. Of the 140 climate-washing cases reviewed between 2016 and 2023, 77 have officially concluded, 54 of which ended with a ruling in favour of the claimant. More than 30 cases in 2023 concerned the "polluter pays" principle, whereby companies are held accountable for climate damage caused by high greenhouse gas emissions. The authors also highlighted six "turning off the taps" cases, which challenge the flow of finance to areas which hinder climate goals.

Early analysis of the near-Earth asteroid Bennu has revealed unexpected evidence of magnesium-sodium phosphate, suggesting Bennu might have originated from a primitive ocean world. Space.com reports: On Earth, magnesium-sodium phosphate can be found in certain minerals and geological formations, as well as within living organisms where it is present in various biochemical processes and is a component of bone and teeth. According to a NASA press release, however, its presence on Bennu surprised the research team because it wasn't seen in the OSIRIS-REx probe's remote sensing data prior to sample collection. The team says its presence "hints that the asteroid could have splintered off from a long-gone, tiny, primitive ocean world." "The presence and state of phosphates, along with other elements and compounds on Bennu, suggest a watery past for the asteroid," said Lauretta. "Bennu potentially could have once been part of a wetter world. Although, this hypothesis requires further investigation."

The OSIRIS-REx spacecraft obtained a sample of Bennu's regolith on October 20, 2020 using its Touch-and-Go Sample Acquisition Mechanism (TAGSAM), which comprises a specialized sampler head situated on an articulated arm. Bennu is a small B-type asteroid, which are relatively uncommon carbonaceous asteroids. "[Bennu] was selected as the mission target in part because telescopic observations indicated a primitive, carbonaceous composition and water-bearing minerals," stated the team in their paper. [...] Further analysis on the samples revealed the prevailing component of the regolith sample is magnesium-bearing phyllosilicates, primarily serpentine and smectite -- types of rock typically found at mid-ocean ridges on Earth. A comparison of these serpentinites with their terrestrial counterparts provides possible insights into Bennu's geological past. "Offering clues about the aqueous environment in which they originated," wrote the team.

While Bennu's surface may have been altered by water over time, it still preserves some of the ancient characteristics scientists believe were present during the early solar system's days. Bennu's surface materials still contain some original features from the cloud of gas and dust from which our solar system's planets formed -- known as the protoplanetary disk. The team's study also confirmed the asteroid is rich in carbon, nitrogen and some organic compounds -- all of which, in addition to the magnesium phosphate, are essential components for life as we know it on Earth.

In a contract worth as much as $843 million, NASA announced today SpaceX has been selected to develop a vehicle that will de-orbit the International Space Station in 2030. "As the agency transitions to commercially owned space destinations closer to home, it is crucial to prepare for the safe and responsible deorbit of the International Space Station in a controlled manner after the end of its operational life in 2030," the U.S. space agency said in a statement. TechCrunch reports: Few details about the U.S. Deorbit Vehicle, as NASA calls the craft, have been released so far. However, NASA clarified that the vehicle will be different from SpaceX's Dragon capsule, which delivers cargo and crew to the station, and other vehicles that perform services for the agency. Unlike these vehicles, which are built and operated by SpaceX, NASA will take ownership of the U.S. Deorbit Vehicle post-development and operate it throughout its mission. Both the vehicle and the ISS will destructively break up as they reenter the atmosphere, and one of the big tasks ahead for SpaceX is to ensure that the station reenters in a way that endangers no populated areas. The launch contract for the U.S. Deorbit Vehicle will be announced separately.

NASA and its partners had been evaluating using a Russian Roscosmos Progress spacecraft to conduct the de-orbit mission, but studies indicated that a new spacecraft was needed for the de-orbit maneuver. The station's safe demise is a responsibility shared by the five space agencies that operate on the ISS -- NASA, the Canadian Space Agency, European Space Agency, Japan Aerospace Exploration Agency, and State Space Corporation Roscosmos -- but it is unclear whether this contract amount is being paid out by all countries.

An anonymous reader shares a report: Since the James Webb Space Telescope began operating two years ago, astronomers have been using it to leapfrog one another millions of years into the past, back toward the moment they call cosmic dawn, when the first stars and galaxies were formed. Last month, an international team doing research as the JWST Advanced Deep Extragalactic Survey, or JADES, said it had identified the earliest, most distant galaxy yet found -- a banana-shaped blob of color measuring 1,600 light-years across. It was already shining with intense starlight when the universe was in its relative infancy, at only 290 million years old, the astronomers said.

The new galaxy, known as JADES-GS-z14-0, is one of a string of Webb discoveries, including early galaxies and black holes, that challenge conventional models of how the first stars and galaxies formed. "This discovery proves that luminous galaxies were already in place 300 million years after the Big Bang and are more common than what was expected," the researchers wrote in a paper posted to an online physics archive. "Galaxy formation models will need to address the existence of such large and luminous galaxies so early in cosmic history," said the authors, who were led by Stefano Carniani, a professor at the university Scuola Normale Superiore in Pisa, Italy.

The galaxy was first spotted during a deep space survey with the Webb's Near Infrared Camera, one of the telescope's workhorse instruments. Within a patch of southern sky known as the Jades Origin Field, which is about a quarter of the size of a full moon, scientists found 11 galaxies that seemed to date from when the universe was less than 400 million years old -- far more than they had expected. Subsequent studies by Dr. Carniani and his colleagues with the telescope's infrared spectrograph revealed that the wavelength of light from JADES-GS-z14-0 had been stretched more than 15-fold by the expansion of the universe (a redshift of 14 to use astronomical jargon), similar to the way a siren's pitch becomes lower as it speeds away. That means light has been coming toward us for 13.5 billion years, since shortly after the universe began. (The universe is about 13.8 billion years old, according to cosmological calculations.) The light from the galaxy is spread over a diffuse region, which indicates that the glow was coming from stars, not the gullet of a black hole. Its brightness corresponded to the output of hundreds of millions of suns, an astonishing number to have formed and assembled in only 290 million years.

Researchers from UC Santa Cruz, UC Davis, LuxiTech, and Soochow University have developed a new method to run AI language models more efficiently by eliminating matrix multiplication, potentially reducing the environmental impact and operational costs of AI systems. Ars Technica's Benj Edwards reports: Matrix multiplication (often abbreviated to "MatMul") is at the center of most neural network computational tasks today, and GPUs are particularly good at executing the math quickly because they can perform large numbers of multiplication operations in parallel. [...] In the new paper, titled "Scalable MatMul-free Language Modeling," the researchers describe creating a custom 2.7 billion parameter model without using MatMul that features similar performance to conventional large language models (LLMs). They also demonstrate running a 1.3 billion parameter model at 23.8 tokens per second on a GPU that was accelerated by a custom-programmed FPGA chip that uses about 13 watts of power (not counting the GPU's power draw). The implication is that a more efficient FPGA "paves the way for the development of more efficient and hardware-friendly architectures," they write.

The paper doesn't provide power estimates for conventional LLMs, but this post from UC Santa Cruz estimates about 700 watts for a conventional model. However, in our experience, you can run a 2.7B parameter version of Llama 2 competently on a home PC with an RTX 3060 (that uses about 200 watts peak) powered by a 500-watt power supply. So, if you could theoretically completely run an LLM in only 13 watts on an FPGA (without a GPU), that would be a 38-fold decrease in power usage. The technique has not yet been peer-reviewed, but the researchers -- Rui-Jie Zhu, Yu Zhang, Ethan Sifferman, Tyler Sheaves, Yiqiao Wang, Dustin Richmond, Peng Zhou, and Jason Eshraghian -- claim that their work challenges the prevailing paradigm that matrix multiplication operations are indispensable for building high-performing language models. They argue that their approach could make large language models more accessible, efficient, and sustainable, particularly for deployment on resource-constrained hardware like smartphones. [...]

The researchers say that scaling laws observed in their experiments suggest that the MatMul-free LM may also outperform traditional LLMs at very large scales. The researchers project that their approach could theoretically intersect with and surpass the performance of standard LLMs at scales around 10^23 FLOPS, which is roughly equivalent to the training compute required for models like Meta's Llama-3 8B or Llama-2 70B. However, the authors note that their work has limitations. The MatMul-free LM has not been tested on extremely large-scale models (e.g., 100 billion-plus parameters) due to computational constraints. They call for institutions with larger resources to invest in scaling up and further developing this lightweight approach to language modeling.

China brought a capsule full of lunar soil [non-paywalled link] from the far side of the moon down to Earth on Tuesday, achieving the latest success in an ambitious schedule to explore the moon and other parts of the solar system. From a report: The sample, retrieved by the China National Space Administration's Chang'e-6 lander after a 53-day mission, highlights China's growing capabilities in space and notches another win in a series of lunar missions that started in 2007 and have so far been executed almost without flaw. "Chang'e-6 is the first mission in human history to return samples from the far side of the moon," Long Xiao, a planetary geologist at China University of Geosciences, wrote in an email. "This is a major event for scientists worldwide," he added, and "a cause for celebration for all humanity."

Such sentiments and the prospects of international lunar sample exchanges highlighted the hope that China's robotic missions to the moon and Mars will serve to advance scientific understanding of the solar system. Those possibilities are contrasted by views in Washington and elsewhere that Tuesday's achievement is the latest milestone in a 21st-century space race with geopolitical overtones. In February, a privately operated American spacecraft landed on the moon. NASA is also pursuing the Artemis campaign to return Americans to the lunar surface, although its next mission, a flight by astronauts around the moon, has been delayed because of technical issues. China, too, is looking to expand its presence on the moon, landing more robots there, and eventually human astronauts, in the years to come.

India is set to embark on an ambitious $168 billion project to link its major rivers, aiming to address water scarcity and boost agriculture in the world's most populous nation. The National River Linking Project, conceived over a century ago, plans to construct 30 canals to transfer an estimated 7 trillion cubic feet of water annually across the country. While government officials tout the project's potential to irrigate farmland and generate hydroelectric power, scientists and environmental experts have raised concerns about its ecological impact. Recent research suggests the project could disrupt monsoon patterns, potentially exacerbating water stress in some regions.

Passant Rabie reports via Gizmodo: A video circulating online appears to show debris from a Chinese rocket falling above a populated area, with residents running for cover as a heavy cloud of dark yellow smoke trails across the sky in a frightening scene. The suspected debris may have come from China's Long March 2C rocket, which launched on Saturday, June 22, carrying a joint mission by China and France to study Gamma-ray bursts. The launch was declared a success, but its aftermath was captured by videos posted to Chinese social media sites.

The videos show what appears to be the first stage rocket booster of the Long March 2C rocket tumbling uncontrollably over a village in southwest China, while local residents cover their ears and run for shelter from the falling debris. There are no reports of injuries or damage to property. That said, unverified video and images show a gigantic cloud erupting at the site of the crashed rocket, and the booster itself seemingly next to a roadway. The first stage of the rocket can be seen leaking fuel, the color of which is consistent with nitrogen tetroxide. The chemical compound is a strong oxidizing agent that is used for rocket propulsion but it can be fatally toxic, according to Jonathan McDowell, astrophysicist at the Harvard-Smithsonian Center.

"It's known in the rocket industry as BFRC, a big fucking red cloud," McDowell told Gizmodo. "And when you see a BFRC, you run for your life." Nitrogen tetroxide was accepted as the rocket propellant oxidizer of choice in the early 1950s by the U.S.S.R. and the United States, however it became less commonly used over the years because it is extremely toxic, according to NASA (PDF). If it comes in contact with skin, eyes, or respiratory system, it can destroy human tissue, and if inhaled through the lungs, it can lead to a build up of fluids or, in extreme cases, death. "It's pretty scary, but this is just how the Chinese do business," McDowell told Gizmodo. "They have a different level of acceptable public risk." "I think over a 10 year period, we may see the older rockets phased out but they're not in any hurry to do so," added McDowell. "They're still launching one a week or something like that, and they are really quite dangerous."

It's been a 1,000 years since there was a significant volcanic eruption from Mount Rainier, CNN reminds readers. It's a full 60 miles from Tacoma, Washington — and 90 miles from Seattle. Yet "more than Hawaii's bubbling lava fields or Yellowstone's sprawling supervolcano, it's Mount Rainier that has many U.S. volcanologists worried."

"Mount Rainier keeps me up at night because it poses such a great threat to the surrounding communities, said Jess Phoenix, a volcanologist and ambassador for the Union of Concerned Scientists, on an episode of CNN's series "Violent Earth With Liv Schreiber." The sleeping giant's destructive potential lies not with fiery flows of lava, which, in the event of an eruption, would be unlikely to extend more than a few miles beyond the boundary of Mount Rainier National Park in the Pacific Northwest. And the majority of volcanic ash would likely dissipate downwind to the east away from population centers, according to the US Geological Survey. Instead, many scientists fear the prospect of a lahar — a swiftly moving slurry of water and volcanic rock originating from ice or snow rapidly melted by an eruption that picks up debris as it flows through valleys and drainage channels.

"The thing that makes Mount Rainier tough is that it is so tall, and it's covered with ice and snow, and so if there is any kind of eruptive activity, hot stuff ... will melt the cold stuff and a lot of water will start coming down," said Seth Moran, a research seismologist at USGS Cascades Volcano Observatory in Vancouver, Washington. "And there are tens, if not hundreds of thousands of people who live in areas that potentially could be impacted by a large lahar, and it could happen quite quickly." The deadliest lahar in recent memory was in November 1985 when Colombia's Nevado del Ruiz volcano erupted. Just a couple hours after the eruption started, a river of mud, rocks, lava and icy water swept over the town of Armero, killing over 23,000 people in a matter of minutes... Bradley Pitcher, a volcanologist and lecturer in Earth and environmental sciences at Columbia University, said in an episode of CNN's "Violent Earth"... said that Mount Rainier has about eight times the amount of glaciers and snow as Nevado del Ruiz had when it erupted. "There's the potential to have a much more catastrophic mudflow...."

Lahars typically occur during volcanic eruptions but also can be caused by landslides and earthquakes. Geologists have found evidence that at least 11 large lahars from Mount Rainier have reached into the surrounding area, known as the Puget Lowlands, in the past 6,000 years, Moran said.
Two major U.S. cities — Tacoma and South Seattle — "are built on 100-foot-thick (30.5-meter) ancient mudflows from eruptions of Mount Rainier," the volcanologist said on CNN's "Violent Earth" series.

CNN's article adds that the US Geological Survey already set up a lahar detection system at Mount Rainier in 1998, "which since 2017 has been upgraded and expanded. About 20 sites on the volcano's slopes and the two paths identified as most at risk of a lahar now feature broadband seismometers that transmit real-time data and other sensors including trip wires, infrasound sensors, web cameras and GPS receivers."

Tuesday a SpaceX Falcon Heavy rocket will launch a special satellite — a state-of-the-art weather-watcher from America's National Oceanic and Atmospheric Administration.

It will complete a series of four GOES-R satellite launches that began in 2016. Space.com drills down into how these satellites have changed weather forecasts: More than seven years later, with three of the four satellites in the series orbiting the Earth, scientists and researchers say they are pleased with the results and how the advanced technology has been a game changer. "I think it has really lived up to its hype in thunderstorm forecasting. Meteorologists can see the convection evolve in near real-time and this gives them enhanced insight on storm development and severity, making for better warnings," John Cintineo, a researcher from NOAA's National Severe Storms Laboratory , told Space.com in an email.

"Not only does the GOES-R series provide observations where radar coverage is lacking, but it often provides a robust signal before radar, such as when a storm is strengthening or weakening. I'm sure there have been many other improvements in forecasts and environmental monitoring over the last decade, but this is where I have most clearly seen improvement," Cintineo said. In addition to helping predict severe thunderstorms, each satellite has collected images and data on heavy rain events that could trigger flooding, detected low clouds and fog as it forms, and has made significant improvements to forecasts and services used during hurricane season. "GOES provides our hurricane forecasters with faster, more accurate and detailed data that is critical for estimating a storm's intensity, including cloud top cooling, convective structures, specific features of a hurricane's eye, upper-level wind speeds, and lightning activity," Ken Graham, director of NOAA's National Weather Service told Space.com in an email.

Instruments such as the Advanced Baseline Imager have three times more spectral channels, four times the image quality, and five times the imaging speed as the previous GOES satellites. The Geostationary Lightning Mapper is the first of its kind in orbit on the GOES-R series that allows scientists to view lightning 24/7 and strikes that make contact with the ground and from cloud to cloud. "GOES-U and the GOES-R series of satellites provides scientists and forecasters weather surveillance of the entire western hemisphere, at unprecedented spatial and temporal scales," Cintineo said. "Data from these satellites are helping researchers develop new tools and methods to address problems such as lightning prediction, sea-spray identification (sea-spray is dangerous for mariners), severe weather warnings, and accurate cloud motion estimation. The instruments from GOES-R also help improve forecasts from global and regional numerical weather models, through improved data assimilation."
The final satellite, launching Tuesday, includes a new sensor — the Compact Coronagraph — "that will monitor weather outside of Earth's atmosphere, keeping an eye on what space weather events are happening that could impact our planet," according to the article.

"It will be the first near real time operational coronagraph that we have access to," Rob Steenburgh, a space scientist at NOAA's Space Weather Prediction Center, told Space.com on the phone. "That's a huge leap for us because up until now, we've always depended on a research coronagraph instrument on a spacecraft that was launched quite a long time ago."