Tech News
“Mockery of science”: Climate scientists tear into new US climate report
Science - Posted On:2025-09-03 10:45:01 Source: arstechnica
More than 85 climate scientists declared the Department of Energy’s new climate report unfit for policymaking in a comprehensive review released Tuesday. The DOE’s report cherry-picked evidence, lacked peer-reviewed studies to support its questioning of the detrimental effects of climate change in the US and is “fundamentally incorrect,” the authors concluded.
Scientists have accurately modeled and predicted the volume and impact of excess CO2 in the Earth’s atmosphere since the 1970s, when Exxon workers first began measuring the impacts of their product on the planet’s atmosphere. Since then, climate science has matured into a crucial tool to help humans gauge how a warming planet may affect everything from weather and crops to the economy and mental health.
“This report makes a mockery of science. It relies on ideas that were rejected long ago, supported by misrepresentations of the body of scientific knowledge, omissions of important facts, arm waving, anecdotes, and confirmation bias,” said Andrew Dessler, a professor of atmospheric sciences at Texas A&M University, in a statement accompanying the review.
Trump’s move of SPACECOM to Alabama has little to do with national security
Science - Posted On:2025-09-02 23:45:00 Source: arstechnica
President Donald Trump announced Tuesday that US Space Command will be relocated from Colorado to Alabama, returning to the Pentagon's plans for the command's headquarters from the final days of Trump's first term in the White House.
The move will "help America defend and dominate the high frontier," Trump said. It also marks another twist on a contentious issue that has pitted Colorado and Alabama against one another in a fight for the right to be home to the permanent headquarters of Space Command (SPACECOM), a unified combatant command responsible for carrying out military operations in space.
Dozens of Scientists Find Errors in a New Energy Department Climate Report
science - Posted On:2025-09-02 22:15:00 Source: slashdot
A group of more than 85 scientists have issued a joint rebuttal to a recent U.S. Department of Energy report about climate change, finding it full of errors and misrepresenting climate science. NPR: The group of climate scientists found several examples where the DOE authors cherry-picked or misrepresented climate science in the agency's report. For instance, in the DOE report the authors claim that rising carbon dioxide can be a "net benefit" to U.S. agriculture, neglecting to mention the negative impacts of more heat and climate-change fueled extreme weather events on crops. The DOE report also states that there is no evidence of more intense "meteorological" drought in the U.S. or globally, referring to droughts that involve low rainfall. But the dozens of climate scientists point out that this is misleading, because higher temperatures and more evaporation -- not just low rainfall -- can lead to and exacerbate droughts. They say that there are, in fact, many studies showing how climate change has exacerbated droughts. Read more of this story at Slashdot.
A robot walks on water thanks to evolution’s solution
Science - Posted On:2025-09-02 16:45:00 Source: arstechnica
Robots can serve pizza, crawl over alien planets, swim like octopuses and jellyfish, cosplay as humans, and even perform surgery. But can they walk on water?
Rhagobot isn’t exactly the first thing that comes to mind at the mention of a robot. Inspired by Rhagovelia water striders, semiaquatic insects also known as ripple bugs, these tiny bots can glide across rushing streams because of the robotization of an evolutionary adaptation.
Rhagovelia (as opposed to other species of water striders) have fan-like appendages toward the ends of their middle legs that passively open and close depending on how the water beneath them is moving. This is why they appear to glide effortlessly across the water’s surface. Biologist Victor Ortega-Jimenez of the University of California, Berkeley, was intrigued by how such tiny insects can accelerate and pull off rapid turns and other maneuvers, almost as if they are flying across a liquid surface.
Our Preoccupation With Protein Intake
science - Posted On:2025-09-01 11:45:00 Source: slashdot
A review of published meta-analyses examining protein supplementation found no evidence supporting intake beyond 1.6 grams per kilogram of body weight daily, according to an analysis by cardiologist Eric Topol. The review examined multiple randomized controlled trials encompassing thousands of participants. The most widely cited Morton study, which included 1,863 participants across 49 trials, showed no statistically significant benefit at higher protein levels, with a p-value of 0.079. Recent research from Washington University identified the essential amino acid leucine as activating mTOR in macrophages, promoting atherosclerosis progression. The mechanism was demonstrated in both mouse models and human studies measuring circulating monocyte changes following acute high-protein challenges increasing dietary protein from 22% to 50% of energy intake. Current USDA data indicates 55% of American men and 35% of women already exceed the 0.8 g/kg/day recommendation from the National Academy of Medicine. The protein supplement industry, exemplified by David bars containing 28 grams of protein in 150 calories using a modified plant fat called EPG, projects $180 million in 2025 sales. Read more of this story at Slashdot.
Beta Blockers for Heart Attack Survivors: May Have No Benefit for Most, Could Actually Harm Women
science - Posted On:2025-08-31 15:30:00 Source: slashdot
"A class of drugs called beta-blockers — used for decades as a first-line treatment after a heart attack — doesn't benefit the vast majority of patients," reports CNN. And in fact beta-blockers "may contribute to a higher risk of hospitalization and death in some women but not in men, according to groundbreaking new research..." Women with little heart damage after their heart attacks who were treated with beta-blockers were significantly more likely to have another heart attack or be hospitalized for heart failure — and nearly three times more likely to die — compared with women not given the drug, according to a study published in the European Heart Journal and also scheduled to be presented Saturday at the European Society of Cardiology Congress in Madrid... The findings, however, only applied to women with a left ventricular ejection fraction above 50%, which is considered normal function, the study said. Ejection fraction is a way of measuring how well the left side of the heart is pumping oxygenated blood throughout the body. For anyone with a score below 40% after a heart attack, beta-blockers continue to be the standard of care due to their ability to calm heart arrhythmias that may trigger a second event... The analysis on women was part of a much larger clinical trial called REBOOT — Treatment with Beta-Blockers after Myocardial Infarction without Reduced Ejection Fraction — which followed 8,505 men and women treated for heart attacks at 109 hospitals in Spain and Italy for nearly four years. Results of the study were published in Mem>The New England Journal of Medicine and also presented at the European Society of Cardiology Congress. None of the patients in the trial had a left ventricular ejection fraction below 40%, a sign of potential heart failure. "We found no benefit in using beta-blockers for men or women with preserved heart function after heart attack despite this being the standard of care for some 40 years," said Fuster, former editor-in-chief of the Journal of the American College of Cardiology and past president of the American Heart Association and the World Health Federation... In fact, most men and women who survive heart attacks today have ejection fractions above 50%, Ib��ez said [Dr. Borja Ib��ez, scientific director for Madrid's National Center for Cardiovascular Investigation]. "Yet at this time, some 80% of patients in the US, Europe and Asia are treated with beta-blockers because medical guidelines still recommend them...." While the study did not find any need to use beta-blockers for people with a left ventricular ejection fraction above 50% after a heart attack, a separate meta-analysis of 1,885 patients published Saturday in The Lancet did find benefits for those with scores between 40% and 50%, in which the heart may be mildly damaged. "This subgroup did benefit from a routine use of beta-blockers," said Ib��ez, who was also a coauthor on this paper. "We found about a 25% reduction in the primary endpoint, which was a composite of new heart attacks, heart failure and all-cause death." Read more of this story at Slashdot.
Smelling This One Specific Scent Can Boost the Brain's Gray Matter
science - Posted On:2025-08-31 11:45:00 Source: slashdot
"According to a new study, wearing the right kind of perfume or cologne can enlarge your brain's gray matter," writes ScienceAlert Researchers from Kyoto University and the University of Tsukuba in Japan asked 28 women to wear a specific rose scent oil on their clothing for a month, with another 22 volunteers enlisted as controls who put on plain water instead. Magnetic resonance imaging ( MRI) scans showed boosts in the gray matter volume of the rose scent participants. While an increase in brain volume doesn't necessarily translate into more thinking power, the findings could have implications for neurodegenerative conditions such as dementia. "This study is the first to show that continuous scent inhalation changes brain structure," write the researchers in their published paper. We've seen scents like this improve memory and cognitive performance, but here the team wanted to try a longer-term experiment to see how triggering our sense of smell might lead to measurable changes in brain structure... It's difficult to pin down exactly what's causing this boost in gray matter. Another possibility raised by the researchers is that the rose scent is actually labeled as unpleasant by the brain, with the subsequent emotional regulation responsible for the PCC working harder and increasing in size. The researchers hope that the findings could be useful in the development of aromatherapies that boost mental health and brain plasticity... The research was published in the Brain Research Bulletin. Read more of this story at Slashdot.
Earth models can predict the planet’s future but not their own
Science - Posted On:2025-08-31 08:00:00 Source: arstechnica
In the 1960s, meteorologist Edward Lorenz was running weather simulations on an early computer system when he realized that a small rounding difference led to extremely divergent weather predictions. He later called this idea the butterfly effect to communicate that small changes in initial conditions, like a butterfly flapping its wings in Nepal, could produce wildly different outcomes, like rain in New York.
But better understanding those initial conditions and how the biological world couples with the atmospheric one can provide better predictions about the future of the planet—from where umbrellas may be most needed in a given season to where electricity needs might sap the grid.
Today, computers are much more powerful than when Lorenz was working, and scientists use a special kind of simulation that accounts for physics, chemistry, biology, and water cycles to try to grasp the past and predict the future. These simulations, called Earth system models, or ESMs, attempt to consider the planet as a system made up of components that nudge and shove each other. Scientists first developed physical climate models in the 1960s and 1970s, and became better at integrating atmospheric and ocean models in subsequent years. As both environmental knowledge and computing power increased, they began to sprinkle in the other variables, leading to current-day ESMs.
Study: Young Children Diagnosed with ADHD Often Prescribed Medication Too Quickly
science - Posted On:2025-08-31 07:45:00 Source: slashdot
"A new study released Friday found that young children diagnosed with attention-deficit/hyperactivity disorder, or ADHD, are often prescribed medication too quickly," reports CBS News: The study, led by Stanford Medicine and published in JAMA Network Open, examined the health records of nearly 10,000 preschool-aged children ages 3 to 5 between 2016 and 2023 who were diagnosed with ADHD... The Stanford study found that about 68% of those children who were diagnosed with ADHD were prescribed medications before age 7, most often stimulants such as Ritalin, which can help children focus their attention and regulate their emotions. The turn to medication often came quickly, according to the study. About 42% of the children who were diagnosed with ADHD were prescribed drugs within 30 days of diagnosis, the study found. "We don't have concerns about the toxicity of the medications for 4- and 5-year-olds, but we do know that there is a high likelihood of treatment failure, because many families decide the side effects outweigh the benefits," Dr. Yair Bannett, assistant professor of pediatrics at Stanford Medicine and the lead author of the study, said in a statement. Those side effects can include irritability, aggressiveness and emotional problems, according to Bannett. "The high rate of medication prescriptions among preschool-age children with ADHD and the lack of delay between initial diagnosis and prescription require further investigation to assess the appropriateness of early medication treatment," the researchers concluded. The study also found that the vast majority of the young children diagnosed with ADHD, about 76%, were boys. CBS News interviewed Jamie Howard, senior clinical psychologist from the Child Mind Institute (who was not involved in the study). Howard said when treating ADHD in young children, clinical guidelines call for starting with "behavioral intervention...." "I think that people have an association with ADHD and stimulant medication... But there is actually a lot more than that. And we want to give kids the opportunity to use these other strategies first, and then if they need medication, it can be incredibly helpful for a lot of kids." Read more of this story at Slashdot.
'Scientists Just Created Spacetime Crystals Made of Knotted Light'
science - Posted On:2025-08-30 13:45:00 Source: slashdot
By exploiting two-color beams, researchers "can generate ordered chains and lattices," reports ScienceDaily, "with tunable topology — potentially revolutionizing data storage, communications, and photonic processing." An internationally joint research group between Singapore and Japan has unveiled a blueprint for arranging exotic, knot-like patterns of light into repeatable crystals that extend across both space and time. The work lays out how to build and control "hopfion" lattices using structured beams.. three-dimensional topological textures whose internal "spin" patterns weave into closed, interlinked loops. They have been observed or theorized in magnets and light fields, but previously they were mainly produced as isolated objects. The authors show how to assemble them into ordered arrays that repeat periodically, much like atoms in a crystal, only here the pattern repeats in time as well as in space. The key is a two-color, or bichromatic, light field whose electric vector traces a changing polarization state over time. By carefully superimposing beams with different spatial modes and opposite circular polarizations, the team defines a "pseudospin" that evolves in a controlled rhythm. When the two colors are set to a simple ratio, the field beats with a fixed period, creating a chain of hopfions that recur every cycle. Starting from this one-dimensional chain, the researchers then describe how to sculpt higher-order versions whose topological strength can be dialed up or down... Topological textures like skyrmions have already reshaped ideas for dense, low-error data storage and signal routing. Extending that toolkit to hopfion crystals in light could unlock high-dimensional encoding schemes, resilient communications, atom trapping strategies, and new light-matter interactions. "The birth of space-time hopfion crystals," the authors write, opens a path to condensed, robust topological information processing across optical, terahertz, and microwave domains. Read more of this story at Slashdot.
China Turns On Giant Neutrino Detector That Took a Decade To Build
science - Posted On:2025-08-30 03:15:01 Source: slashdot
China has turned on the world's most sensitive neutrino detector after more than a decade of construction. The Register reports: The Jiangmen Underground Neutrino Experiment (JUNO) is buried 700 meters under a mountain and features a 20,000-tonne "liquid scintillator detector" that China's Academy of Science says is "housed at the center of a 44-meter-deep water pool." There's also a 35.4-meter-diameter acrylic sphere supported by a 41.1-meter-diameter stainless steel truss. All that stuff is surrounded by more than 45,000 photo-multiplier tubes (PMTs). The latter devices are super-sensitive light detectors. A liquid scintillator is a fluid that, when exposed to ionizing radiation, produces light. At JUNO, the liquid is 99.7 percent alkylbenzene, an ingredient found in detergents and refrigerants. JUNO's designers hope that any neutrinos that pass through its giant tank bonk a hydrogen atom and produce just enough light that the detector array of PMTs can record their passing, producing data scientists can use to learn more about the particles. At this point, readers could sensibly ask how JUNO will catch any of these elusive particles. The answer lies in the facility's location -- a few tens of kilometers away from two nuclear power plants that produce neutrinos. The Chinese Academy of Science's Journal of High Energy Physics says trials of JUNO succeeded, suggesting it will be able to help scientists understand why some neutrinos are heavier than others so we can begin to classify the different types of the particle -- a key goal for the facility. The Journal also reports that scientists from Japan, the United States, Europe, India, and South Korea, are either already using JUNO or plan experiments at the facility. Read more of this story at Slashdot.
Rocket Report: SpaceX achieved daily launch this week; ULA recovers booster
Science - Posted On:2025-08-29 09:00:00 Source: arstechnica
Welcome to Edition 8.08 of the Rocket Report! What a week it's been for SpaceX. The company completed its first successful Starship test flight in nearly a year, and while it wasn't perfect, it sets up SpaceX for far more ambitious tests ahead. SpaceX's workhorse rocket, the Falcon 9, launched six times since our last edition of the Rocket Report. Many of these missions were noteworthy in their own right, including the launch of the US military's X-37B spaceplane, an upgraded Dragon capsule to boost the International Space Station to a higher orbit, and the record 30th launch and landing of a flight-proven Falcon 9 booster. All told, that's seven SpaceX launches in seven days.
As always, we welcome reader submissions. If you don't want to miss an issue, please subscribe using the box below (the form will not appear on AMP-enabled versions of the site). Each report will include information on small-, medium-, and heavy-lift rockets, as well as a quick look ahead at the next three launches on the calendar.
Firefly announces cause of Alpha launch failure. Firefly Aerospace closed the investigation into the failure of one of its Alpha rockets during an April mission for Lockheed Martin and received clearance from the FAA to resume launches, Payload reports. The loss of the launch vehicle was a dark cloud hanging over the company’s otherwise successful IPO this month. The sixth flight of Firefly's Alpha rocket launched in April from Vandenberg Space Force Base, California, and failed when its first stage booster broke apart milliseconds after stage separation. This created a shockwave that destroyed the engine nozzle extension on the second stage, damaging the engine before the second stage ran out of propellant seconds before it attained orbital velocity. Both stages ultimately fell into the Pacific Ocean.
Nanoparticles Turn Houseplants Into Night Lights
science - Posted On:2025-08-29 03:15:00 Source: slashdot
Longtime Slashdot reader cristiroma shares a report from New Atlas: Wouldn't it be great if the plants in your home could do more than just sit there looking pretty? Researchers at South China Agricultural University in the city of Guangzhou have found a way to upgrade them into soft glowing night lights in a range of hues, with the use of nanoparticles. The team developed a light-emitting phosphor compound that enabled succulents with fleshy leaves to charge in sunlight or indoor LED light in just a couple of minutes, and then emit a soft uniform glow that lasts up to two hours. The afterglow phosphor compound -- which is similar to those found in glow-in-the-dark toys -- is inexpensive, biocompatible, and negates the need for more complex methods of infusing bioluminescence in plants, like genetic modification. It simply gets injected into the leaves. [...] Beyond modifying a commercial compound for this project, the team also had to figure out the right size for the phosphor particles so they'd work as intended inside plants. Shuting Liu, first author on the study that appeared in Matter this week, noted, "Smaller, nano-sized particles move easily within the plant but are dimmer. Larger particles glowed brighter but couldn't travel far inside the plant." Through extensive testing, the researchers arrived at an optimal size of around 7 micrometers, about the width of a red blood cell. They also determined through experimentation that the particles worked best in succulents, rather than plants with thinner leaves like bok choy. Once they'd landed on the right particle size, loading concentration, and plant type, the team found that the phosphor material diffused into succulent leaves almost instantly, and uniformly lit up entire leaves -- enough to illuminate nearby objects. The scientists were also able to create modified phosphors that glowed in colors like green, red, and blue. That could make for novel indoor or garden decor, as well as pathway lighting. These luminous plants also don't cost much -- according to Liu, "Each plant takes about 10 minutes to prepare and costs a little over 10 yuan (about $1.4), not including labor." Over the course of 10 days, the injected plants didn't show any signs of damage, yellowing, structural integrity, or even reduced levels of chlorophyll. Read more of this story at Slashdot.
Genetically, Central American mammoths were weird
Science - Posted On:2025-08-28 19:15:01 Source: arstechnica
We tend to lump all mammoths together as big, hairy elephant-like beasts with enormous tusks. But there were a number of mammoth species, including less furry ones that inhabited temperate regions. And the furry ones include at least three species: the Eurasian steppe mammoth, the Arctic-specializing woolly mammoth, and the late-evolving North America-only Columbian mammoth.
Because these species inhabited the Arctic, it has been remarkably easy to obtain DNA from them, providing a genetic picture of their relations. The DNA suggests that the woolly mammoth is an offshoot of the steppe mammoth lineage, and was the first to migrate into North America. But the Columbian mammoth was a bit of an enigma; some genetic data suggested it was also a steppe offshoot, while other samples indicated it might be a woolly/steppe hybrid.
But all of that data came from animals living in colder environments. In contrast, the Columbian mammoth ranged as far south as Central America. And now, a group of researchers has managed to obtain a bit of genetic information from bones found in the Basin of Mexico, which includes Mexico City. And these mammoths appear to form a distinct genetic cluster, and are all more closely related to each other than to any other woolly or Columbian mammoths.
Humans Inhale as Much as 68,000 Microplastic Particles Daily, Study Finds
science - Posted On:2025-08-28 14:15:01 Source: slashdot
Every breath people take in their homes or car probably contains significant amounts of microplastics small enough to burrow deep into lungs, new peer-reviewed research finds, bringing into focus a little understood route of exposure and health threat. The Guardian: The study, published in the journal Plos One, estimates humans can inhale as much as 68,000 tiny plastic particles daily. Previous studies have identified larger pieces of airborne microplastics, but those are not as much of a health threat because they do not hang in the air as long, or move as deep into the pulmonary system. The smaller bits measure between 1 and 10 micrometers, or about one-seventh the thickness of a human hair, and present more of a health threat because they can more easily be distributed throughout the body. The findings "suggest that the health impacts of microplastic inhalation may be more substantial than we realize," the authors wrote. Read more of this story at Slashdot.
Trump admin dismisses Endangered Species List as “Hotel California”
Science - Posted On:2025-08-28 13:00:01 Source: arstechnica
“You can check out any time you like, but you can never leave.”
It’s the ominous slogan for “Hotel California,” an iconic fictional lodging dreamed up by the Eagles in 1976. One of the rock band’s lead singers, Don Henley, said in an interview that the song and place “can have a million interpretations.”
For US Interior Secretary Doug Burgum, what comes to mind is a key part of one of the country’s most central conservation laws.
New dinosaur species is the punk rock version of an ankylosaur
Science - Posted On:2025-08-28 10:45:00 Source: arstechnica
Ankylosaurs, with their squat, armored bodies and bizarre, weaponized tails, are an iconic group of dinosaurs. While there were plenty of species present in the Cretaceous, they're thought to have origins that trace back to the Jurassic. It has been hard to say much about those origins, however, because the fossil evidence was so sparse. One of the earliest potential ankylosaur species, Spicomellus, was known from only a single partial rib; others are known only by jaw fragments or teeth.
Now, however, we have a much better picture of what Spicomellus afer looks like thanks to a much larger collection of bones discovered in Morocco. It turns out that the heavy armor and rows of chunky spikes found on Cretaceous ankylosaurs were actually subdued compared to the massive rows of meter-long spikes and bony collars found on Spicomellus. It looks like what would happen if you combined the aesthetics of punk with the flamboyance of glam and made a dinosaur out of the results.
Cretaceous ankylosaurs share a number of common features. One is a short, broad body form that kept the herbivores close to the ground when on all four limbs. Another common feature: bony plates, formed from the skin, that provided the animal with the equivalent of body armor. Some of these, especially along the animal's ribs, thickened into short, blunt spikes that provided added protection. Finally, many species had tails that ended in club-like growths that attached to the vertebrae in the tail through features with the highly technical name of "handles."
World's First 1-Step Method Turns Plastic Into Fuel At 95% Efficiency
science - Posted On:2025-08-28 06:15:00 Source: slashdot
A U.S.-China research team has developed the world's first one-step process to convert mixed plastic waste into gasoline and hydrochloric acid with up to 95-99% efficiency, all at room temperature and ambient pressure. InterestingEngineering reports: As the authors put it, "The method supports a circular economy by converting diverse plastic waste into valuable products in a single step." To carry out the conversion, the team combines plastic waste with light isoalkanes, hydrocarbon byproducts available from refinery processes. According to the paper, the process yields "gasoline range" hydrocarbons, mainly molecules with six to 12 carbons, which are the primary component of gasoline. The recovered hydrochloric acid can be safely neutralized and reused as a raw material, potentially displacing several high-temperature, energy-intensive production routes described in the paper. "We present here a strategy for upgrading discarded PVC into chlorine-free fuel range hydrocarbons and [hydrochloric acid] in a single-stage process," the researchers said. Reported conversion efficiencies underscore the potential for real-world use. At 86 degrees Fahrenheit (30 degrees Celsius), the process reached 95 percent conversion for soft PVC pipes and 99 percent for rigid PVC pipes and PVC wires. In tests that mixed PVC materials with polyolefin waste, the method achieved a 96 percent solid conversion efficiency at 80 degrees Celsius (176 degrees Fahrenheit). The team describes the approach as applicable beyond laboratory-clean samples. "The process is suitable for handling real-world mixed and contaminated PVC and polyolefin waste streams," the paper states. SCMP points to an ECNU social media post citing the study, which characterized the achievement as a first, efficiently converting difficult-to-degrade mixed plastic waste into premium petrol at ambient temperature and pressure in a single step. Read more of this story at Slashdot.
With Starship Flight 10, SpaceX Prioritized Resilience Over Perfection
science - Posted On:2025-08-27 23:45:00 Source: slashdot
An anonymous reader quotes a report from TechCrunch: SpaceX has long marketed Starship as a fully and rapidly reusable rocket that's designed to deliver thousands of pounds of cargo to Mars and make life multiplanetary. But reusability at scale means a space vehicle that can tolerate mishaps and faults, so that a single failure doesn't spell a mission-ending catastrophe. The 10th test flight on Tuesday evening demonstrated SpaceX's focus on fault tolerance. In a post-flight update, SpaceX said the test stressed "the limits of vehicle capabilities." Understanding these edges will be critical for the company's plans to eventually use Starship to launch Starlink satellites, commercial payloads, and eventually astronauts. When the massive Starship rocket lifted off on its 10th test flight Tuesday evening, SpaceX did more than achieve new milestones. It purposefully introduced several faults to test the heat shield, propulsion redundancy, and the relighting of its Raptor engine. The heat shield is among the toughest engineering challenges facing SpaceX. As Elon Musk acknowledged on X in May 2024, a reusable orbital return heat shield is the "biggest remaining problem" to 100% rocket reusability. The belly of the upper stage, also called Starship, is covered in thousands of hexagonal ceramic and metallic tiles, which make up the heat shield. Flight 10 was all about learning how much damage the ship can accept and survive when it goes through atmospheric heating. During the tenth test, engineers intentionally removed tiles from some sections of the ship, and experimented with a new type of actively cooled tile, to gather real-world data and refine designs. [...] Propulsion redundancy was also put to the test. The Super Heavy booster's landing burn configuration appeared to be a rehearsal for engine failure. Engineers intentionally disabled one of the three center Raptor engines during the final phase of the burn and used a backup engine in its place. That was a successful rehearsal for an engine-out event. Finally, SpaceX reported the in-space relight of a Raptor engine, described on the launch broadcast as the second time SpaceX has pulled this off. Reliable engine restarts will be necessary for deep-space missions, propellant transfers, and possibly some payload deployment missions. [...] The next step is translating Flight 10 data into future hardware upgrades to move closer to routine operations and days when, as Musk envisioned, "Starship launches more than 24 times in 24 hours." Read more of this story at Slashdot.
The first stars may not have been as uniformly massive as we thought
Science - Posted On:2025-08-27 12:31:03 Source: arstechnica
For decades, astronomers have wondered what the very first stars in the universe were like. These stars formed new chemical elements, which enriched the universe and allowed the next generations of stars to form the first planets.
The first stars were initially composed of pure hydrogen and helium, and they were massive—hundreds to thousands of times the mass of the Sun and millions of times more luminous. Their short lives ended in enormous explosions called supernovae, so they had neither the time nor the raw materials to form planets, and they should no longer exist for astronomers to observe.
At least that’s what we thought.