A new study proposes using shoebox-sized detector satellites to sniff out nuclear weapons launched by adversary nations. The idea is aimed at addressing fears that a space-based nuclear detonation could destroy satellites across low Earth orbit and make some orbits unusable for years. Space.com shares the findings from a new paper authored by Areg Danagoulian, an associate professor of nuclear science and engineering at the Massachusetts Institute of Technology: No reliable way currently exists to detect and defuse a nuclear bomb in space. Danagoulian proposes a constellation of small "9U" cubesats, each one about the size of a large shoebox and each carrying a special detector capable of sensing radiation emitted by unexploded nuclear bombs. He explores a scenario in which Russia launches a suspected space nuke into an orbit with an altitude of 1,200 miles (2,000 km). That number is not random. In 2022, Russia's Kosmos 2553 satellite, orbiting at that exact altitude, triggered suspicions it might be testing components for a future orbital nuclear weapon.

Russia claims the satellite just observes Earth. At that altitude, the satellite passes through the Van Allen belt, a region of intense cosmic radiation trapped by Earth's magnetic field. Most of the belt stretches between altitudes of around 600 miles (1,000 km) to tens of thousands of miles, but in some areas the radiation can reach much closer to Earth's surface. The interaction between the fissile material inside the nuke and the energetic particles from the radiation belt would create distinct signatures, Danagoulian said, which could help confirm whether a suspicious satellite carries a nuke or not.

"The thermonuclear weapon would contain a significant amount of uranium," Danagoulian said. "The high-energy protons [in the uranium] would break up when another proton is coming in and shred the nuclei. That would knock out a large number of neutrons. This interaction turns that device into a very intense neutron source that otherwise would not be there." he process is known as proton-induced neutron spallation, which essentially means the ejection of fragments from material triggered by impacts of protons. The detector satellite Danagoulian proposes would have to be able to get quite close to the suspect spacecraft -- a few kilometers.

The inspector spacecraft would carry a sensor combining two types of detectors. At the heart of the device is a neutron scintillator, which detects all incoming neutrons and protons. Around it is a "cage of diamond" detector that detects only neutrons -- not protons. Such a set-up helps filter out the particles present in the environment naturally, said Danagoulian. In addition, by using two "planes of neutron detectors," the sensor can determine the direction from which the neutrons arrived. "If the external diamond detector triggers and gives a signal, you can ignore the particle, because it's most likely a proton and not a neutron," said Danagoulian. "Once you identify those neutrons, by having those two detections, you can back project and find out where the neutron came from."

Danagoulian says such a nuke sniffer would have to be launched into an orbit aligned with that of the suspicious satellite and creep up as close as 2.5 miles (4 km) from it. It would then take about a week to gather enough measurements to confirm whether the object is hiding a nuke or not. A constellation of 10 such satellites could reduce the process to mere hours, Danagoulian said. If a nuke were detected, the military could then try to jam the satellite's communications link from the ground, making it impossible for the adversary to remotely detonate the bomb. There is currently no technology available to safely defuse a nuclear weapon in space. [...] Danagoulian also suggests that high-grade radiation hardening could improve satellites' chances of surviving a nuclear winter in space. The paper has been published in the journal Nature.

An anonymous reader quotes a report from the New York Times: An Australian beach community was confused -- and later delighted -- by the discovery of six metallic-looking spheres that washed ashore last week. The mystery, and the ensuing attention, prompted a bunch of alien jokes from local residents and businesses. But Australia's space agency put the speculation to rest on Monday, saying that the spheres appeared to be rocket debris that had recently re-entered the atmosphere from orbit.

The objects were found on Forrest Beach in the northeastern state of Queensland over the weekend, the state's fire department said. Residents described them as being about twice the size of a basketball. "The recovered objects appear to be pressure vessels from a space launch vehicle," the Australian Space Agency said in a statement, adding that they were "consistent with debris from a foreign rocket body." The agency said that it had identified the likely source of the objects, without providing further details, and was working with international authorities to confirm the vehicle from which the debris originated.

New Zealand startup Zenno Astronautics has completed the first orbital test of its "Supertorquer," a shoebox-sized superconducting magnet system that uses solar power and Earth's magnetic field to help control a satellite without fuel. The company says the technology could eventually support fuel-free satellite maneuvers, docking, deep-space trajectory changes, and even magnetic radiation shielding for astronauts. Space Magazine reports: The tests began shortly after Mira's launch in November last year aboard the SpaceX Transporter 12 mission and saw the shoebox-size device perform with flying colors, Zenno Astronautics CEO and founder Max Arshavsky, told Space.com. "It's a technology that allows a spacecraft to not tumble violently in space and point in the right direction," Arshavsky said. "The unit has multiple super-conducting magnets that are positioned in different axes. When we power up the magnets, they generate a magnetic field, which interacts with Earth's magnetic field, and because we can control the magnetic field on the satellite, we can control the way in which it turns with respect to Earth."

Superconducting magnets are made of coils of superconducting wire that have zero electrical resistance and can therefore conduct much larger currents than normal wires. That larger current translates into a greater magnetic force. There is, however, a catch: Superconducting materials need to be cooled to extremely low temperatures to gain their wonder properties. [...] The unit housing the superconducting magnets is wrapped in layers of insulation and fitted with a heat pump that removes all the excess heat from the system. Every time the satellite needs a push, the superconducting coils power up, drawing energy from a battery charged by the satellite's solar panels.

"It's converting solar energy straight into useful work," Arshavsky said. "Energy is the one thing that is abundant in space, and you can use it to energize the magnet to create a magnetic acceleration device. It gives you acceleration without fuel." In the future, Zenno Astronautics plans to launch larger systems that could enable spacecraft to dock in space or conduct close proximity operations using just the power of their solar-powered superconducting magnets. Arshavsky envisions powerful magnets that could, in the future, propel spacecraft on missions to the moon and Mars using only solar power.

Japan's Hayabusa2 probe captured rare close-up images of near-Earth asteroid Torifune, revealing a snowman-like shape made of two joined lobes. Phys.org reports: The fridge-sized Hayabusa2 skimmed asteroid Torifune on Sunday in a mission that demonstrated the ability to deflect a potentially dangerous space rock away from Earth. A new image released by the Japan Aerospace Exploration Agency (JAXA) on Monday could aid such efforts, as researchers say near-Earth asteroids vary in their size, shape and surface characteristics.

"The moment I actually saw this image and the scientific data -- it really gave me goosebumps," JAXA scientist Yuya Mimasu told reporters, adding the asteroid "personally looked like a snowman." The black-and-white image, captured by a telescopic camera, showed what appeared to be two round objects joined together. "You can actually see the rocks... I really hadn't expected to be able to take a photo like this, so I'm absolutely over the moon," he said.

[...] Moving at a speed of more than 18,000 kilometers (11,185 miles) per hour, the probe was due to fly within 800 meters (2,625 feet) of the asteroid, but JAXA said it would analyze the distance later. If confirmed, the mission would be one of the closest flybys of a near-Earth asteroid ever. JAXA also said Monday it succeeded in acquiring data from three other devices that can measure the distance from the asteroid and examine the existence of water.

A new study suggests multilingualism may slow brain aging, with bilingual people showing brains that appear about six years younger than monolingual speakers and people who speak four languages showing brains that appear up to 13 years younger. Researchers say earlier language learning and higher proficiency appear to strengthen the effect. The Guardian reports: Our brains are made up of billions of nerve cells that communicate with one another. But as we get older, the connectivity in our brains often deteriorates, causing memory and speed of thought to decline. While previous research had observed that people from European countries with greater language proficiency tended to age more slowly, this study measured the impact of speaking languages on individual brains. Scientists in Spain, Chile, Argentina and Dublin compared people living in the Basque region -- characterized by high levels of multilingualism -- who spoke Spanish, Basque, French and/or English.

To measure neurological age, the scientists used magnetoencephalography to measure the brain activity of 728 people with varying ages and levels of linguistic ability. They then used AI to process the results to calculate a normal level of brain connectivity at any given age. A second unrelated group of 144 people were then scanned and compared, comprising equal numbers of people speaking one, two, three or four languages.

Dr Lucia Amoruso, from the Basque Center on Cognition, Brain and Language in San Sebastian, said: "In simple terms, people who spoke more languages tended to have brains that looked younger than expected for their chronological age. The effect was not only related to the number of languages spoken. Higher language proficiency and earlier acquisition of a second language were also associated with more delayed brain ageing. This suggests that multilingual experience matters as a gradient: it is not simply about being bilingual or not, but about the depth and duration of language experience."

CNN reports: Prehistoric human relatives, nicknamed "hobbits" due to their short stature, may have been scavengers, rather than skilled hunters capable of taking down big game or building cooking fires, according to new research. The study adds to growing evidence that Homo floresiensis, which had a brain only slightly bigger than that of a chimpanzee, wasn't as advanced as scientists previously believed....

The researchers believe that much like how Komodo dragons hunt water buffaloes today, they were using their venomous bite to take down Stegodons — and after the scene was clear, Homo floresiensis swept in to cleave meat from what remained... The new study reinforces a long-held suspicion that Homo floresiensis is not a dwarfed form of Homo erectus but a descendant of a more primitive Homo habilis-like or Australopithecus-like form that arrived on the island more than1 million years ago, said Dr. Chris Stringer, a research leader specializing in human origins and paleoanthropology at London's Natural History Museum.

South Carolina's pine forests "have spent centuries hiding a secret as old as America itself," reports CBS News: In August 1780, British and American soldiers clashed there, leading to a terrible defeat for the Continental army [fighting for the 13 colonies rebelling against England]. Battlefield archaeologists Jim Legg and Steve Smith have been studying the site for decades, but recently, they made a shocking discovery: The sandy soil was home to several sets of remains buried in shallow graves. Metal buttons suggested the men had been Continental soldiers, but there was no other identification... About 2,000 Continental soldiers were killed, wounded or captured, and some men never returned home.

Their families could only guess at their fates. But Legg and Smith's discovery, paired with an explosion in DNA technology, is changing what's possible. A set of remains, previously known only as 9B, has been identified as John Pumphrey, a young man from Maryland who enlisted in the Continental Army's 7th Maryland Regiment as young as 13...

Pumphrey likely marched more than a thousand miles with the regiment. The unit fought in battles with then-Gen. George Washington in New Jersey and Pennsylvania... The Pumphrey family still exists today. The DNA that helped identify Pumphrey's remains came from three women: Pam Donahue, Karen Pumphrey Etchison, and Nancy Pumphrey White... In late June, members of the extended Pumphrey family came together to hear his story and say his name for the first time in centuries. His remains are interred in South Carolina, where he and the other soldiers were discovered, but the tombstone, once marked "Unknown," will soon have his name carved on it.

The Verge argues that researchers "have made genuine progress in quantum computing — it's just been largely incremental and too esoteric to immediately capture the public's imagination."

And there are predictions that quantum computers will finally do something useful as soon as 2028: The drama can overshadow the real progress in quantum computing... Researchers have improved the qubits themselves, so they hold onto information longer. When they hold onto information longer, you can fit in more operations and do more complicated algorithms. Last November, Andrew Houck of Princeton University and his colleagues reported that they'd made a superconducting qubit that can hold onto information three times longer than the previous record holder... And in the last two years, researchers have made substantial strides in what's known as quantum error correction... In addition, researchers have developed algorithms to correct errors while the quantum computer operates... Microsoft claimed, which experts dispute, that it made an object made of electrons known as a Majorana particle [which should make fewer errors and be easier to scale up]...

"We 100 percent stand behind our results. We stand by our roadmap," Microsoft's quantum lead, Chetan Nayak, responded in an interview with The Verge. In an email statement, he added that Microsoft's "papers do show that we are creating and controlling Majorana [particles]... Microsoft's supporting evidence is unconvincing [according to [Henry Legg, a physicist from the University of St. Andrews and a longtime Microsoft critic]Rnqyq. What it claimed as evidence of a Majorana particle, he says, could actually be due to quantum dots forming in its device. Quantum dots are electron-containing objects that are not useful for Microsoft's quantum computer. It also bases its claim on data from a single device, says Legg. He wants to see Microsoft replicate the results in multiple chips. "If you repeatedly try and find Jesus in your toast, eventually you'll find Jesus in your toast," he says. "But that one piece of toast doesn't mean you had some kind of epiphany."

"While we appreciate the religious fervor, our data maintains the strength and consistency of our roadmap, as we have for the past several years across previous milestones. We look forward to delivering the world's first quantum machine and sharing the energy of our achievements with the world," wrote Nayak in response.

Past spurious work from Microsoft-affiliated researchers adds to the doubt. In 2021, the journal Nature retracted an article from Microsoft-affiliated researchers in which they'd claimed strong experimental evidence that they'd created a Majorana particle.
"Even hopeful experts have varying opinions about when a quantum computer will demonstrate something useful," the article acknowledges.

But quantum computing lecturer Eleanor Crane of King's College London predicts researchers will have demonstrated a useful scientific simulation on a quantum computer by 2028.

Thanks to Slashdot reader joshuark for sharing the article.

The US age-adjusted death rate fell to a record low in 2025, likely pushing life expectancy to a record high as overdose deaths declined and mortality improved across all age groups. CNN reports: There were about 689 deaths for every 100,000 people in the US in 2025, according to a new report from the US Centers for Disease Control and Prevention -- the lowest rate recorded in more than a century of tracking. The age-adjusted rate has fallen 22% since 2021, landing about 4% lower than it was just before the pandemic in 2019. [...] The top causes of death in the US in 2025 followed longstanding patterns: Heart disease led with nearly 695,000 deaths, followed by cancer with nearly 623,000 deaths.

Unintentional injuries, which includes drug overdoses, were the third leading cause of death. Overdose deaths are still high -- about 70,000 people died from an overdose in 2025, preliminary CDC data shows -- but experts say that sharp declines probably played a large role in bringing the age-adjusted death rate down in the US.

Amazon says its Leo satellite network now has enough spacecraft in orbit to begin limited commercial internet service, with 396 satellites providing "continuous service across initial latitudes." Early performance will likely be uneven, however, and well behind Starlink. "It'll be years before Amazon can boast similar performance numbers as it continues to launch a planned 3,232 Leo satellites," reports The Verge. From the report: SpaceX went live with its "Better than nothing beta" back in 2020 when it had almost 900 satellites operating in low-Earth orbit. It initially served a narrow band of users in the upper US and Canada, who complained about frequent service interruptions and high sensitivity to obstructions, with speeds between 50Mbps and 150Mbps, and latency from 20ms to 40ms. By 2022, the service and coverage areas had already dramatically improved. [...]

SpaceX currently has over 10,000 Starlink satellites in operation, providing robust internet connectivity on land, sea, and air in over 160 countries. Performance varies by the dish, service level paid for, time of day, and location of the user, but we're now talking 200Mbps median download speeds, 10Mbps to 40Mbps uploads, and latency hovering around 25ms.

An anonymous reader quotes a report from The Guardian: Researchers who tracked more than 90,000 people over a decade found that sitting or lying down while awake for more than 30 minutes in one period each day was associated with an increased risk of cancer death. The risk increases for every additional hour of continuous inactivity, the findings suggest. However, the researchers also found breaking up periods of sedentary behavior longer than 30 minutes with bursts of physical activity could help reduce the risk. Getting up every half-hour, even for a short walk around the office, could do wonders for your health, they said.

[...] The findings, published in Plos Medicine, focused on the health effects of prolonged sedentary behavior on a daily basis. [...] The team analyzed data from wearable devices worn by more than 91,000 UK Biobank participants, who were followed for an average of 12 years. The findings suggest prolonged inactivity lasting more than 30 minutes was associated with cancer risks. Each additional hour of prolonged inactivity every day was associated with a 10% increase in risk of cancer death. However, replacing long spells of inactivity with movement appeared to reduce that risk. Substituting one hour of sedentary behavior each day with light physical activity, such as ironing or washing up, was associated with a 12% lower risk of cancer death.

Replacing 30 minutes of inactivity each day with 30 minutes of moderate physical activity, such as walking at an average pace, was associated with an 8% lower risk. The risk was 22% lower when five minutes of inactivity was replaced with five minutes of vigorous physical activity each day, the study suggested. There were limitations to the research, including the fact that the researchers performed a statistical analysis of an observational study, so could not prove causation.

IEEE Spectrum argues that orbital data centers remain far from economically or technically practical despite Elon Musk's prediction that space will become the cheapest place to run AI within a few years. Deploying SpaceX's proposed million-satellite constellation would require enormous increases in launch and manufacturing capacity, while cooling, radiation, maintenance, latency, orbital debris, and astronomical interference present major unresolved obstacles. Longtime Slashdot reader xetdog shares the report: Consider this: There are roughly 14,500 active satellites in orbit. Musk's Starlink constellation accounts for about two thirds of those. Both the launch cadences and satellite-manufacturing capacity would have to scale up astronomically to deploy a million orbital data center satellites. For context, there have been roughly 7,000 orbital launches in all of human history. To loft 1 million satellites into low Earth orbit on SpaceX's Starship, which is designed to carry up to 60 satellites per vehicle, would require 16,666 launches exclusively devoted to satellite deployments. Considering that SpaceX launched a record 165 orbital missions in 2025, even at 10 times that cadence, it would take a decade. And how long would it take to build 1 million satellites, given Starlink's current pace of around 4,000 per year and a generous tenfold increase in capacity? Short of a manufacturing revolution, try 25 years. Dissipating heat in space also requires enormous radiators. As IEEE Spectrum editor Dina Genkina noted, startup Starcloud has sent only one Nvidia H100 GPU into orbit, and "their radiator was too weak to let the chip run at full power." A single 700-watt H100 would require about 1.4 square meters of radiator area, while a 100-megawatt data center could need 2,500 radiators measuring 80 square meters each.

So, why are the hyperscalers hyping orbital data centers? Answer: because it's lucrative. "The Elon Musk part of it is honestly genius because he's got xAI building the data centers, SpaceX sending them to space, and Tesla building solar panels," Genkina says. "It's almost like he's paying himself."

AleRunner writes: The first fully synthetic cell ("SpudCell") has been created in the Department of Genetics at the University of Minnesota. Strictly speaking, it's described as a "cell-like system constructed entirely from known chemical components that can perform a complete cell cycle." It is able to replicate, but only for approximately five generations.

The key advance is that the cell is "built entirely bottom-up from individually purified, non-living components," although it still contains material from E. coli bacteria. "PURE is a defined mixture of 36 purified enzymes from E. coli bacteria," including ribosomes, that provides the infrastructure for genetic replication.

CNN has an article on the advance, including interview material with Professor Kate Adamala, who led the research. "I know the full ingredient list of the cell. I know exactly what chemicals, what molecules, at what concentrations," she said. "It is fully defined, which means we can engineer it." "Humans did not create life," notes an anonymous Slashdot reader. "Researchers call it a constructed cell, not 'life created in the lab' but a 'genuine milestone on the road toward that question.' It lacks full autonomy (needs feeding, no independent evolution)."

Special thanks to Slashdot readers kemosabi and AleRunner for submitting the story and additional sources, including reports from The New York Times and The Guardian, as well as information from the University of Minnesota Twin Cities.

An anonymous reader quotes a report from Space.com: NASA provided an Artemis update today (June 30), announcing new lunar landing contracts for its Moon Base initiative and a surprise new possible rover mission that could be headed to the moon's south pole. During the second monthly update that NASA has provided for its moon base plans, the agency named Astrobotic, Firefly Aerospace and Intuitive Machines as the providers of four robotic landers that will deliver scientific payloads to the surface of the moon, as NASA tests and expands the technologies needed for a permanent human outpost. "This is this drawing on the playbook that worked very well for NASA during the 1960s," NASA Administrator Jared Isaacman said during the livestreamed update, explaining the experiential approach to a crewed lunar return. "We didn't just jump right to Apollo 11."

Isaacman also announced the potential repurposing of an engineering development model built to mirror the agency's Perseverance and Curiosity rovers on Mars. "There is another," Isaacman said, quoting Yoda's line from "Star Wars: The Empire Strikes Back." That test rover is called PROMISE, short for "Polar Rover for Observation, Mapping, and In-Situ Exploration" (though it was formerly known as Optimism). PROMISE was developed at NASA's Jet Propulsion Laboratory (JPL) in Southern California, where it has been used as a test platform for fixes or commands that engineers want to try on the ground before permanently sending them to Perseverance and Curiosity. Now, NASA wants to send PROMISE on a mission of its own. Though sending PROMISE to the moon would leave Perseverance and Curiosity -- both of which remain active on Mars -- without an Earth-based testbed, Isaacman thinks it would be worth it. "We've had years now of experience operating the two rovers on the surface of Mars, and we've got this hardware that the taxpayers have invested a lot in," he said. "So the question was posed: 'What if we send it to the moon?'"

With a little refurbishment, PROMISE would help advance NASA's lunar plans, Isaacman added. Like Perseverance and Curiosity, the test rover is powered by a radioisotope thermoelectric generator (RTG), which converts heat from naturally decaying radioactive material into electricity. So it wouldn't require sunlight to operate -- a real benefit on the moon, where most locations experience long stretches of darkness. (NASA plans to build its Artemis base near the moon's south pole, which is thought to harbor an abundance of water ice and also has a relatively complex lighting environment.) The other robots currently in the works to launch on future missions to the moon, including the landers announced during today's update, are all solar powered. Through 2029, NASA hopes to launch up to 20 such missions as part of the CLPS (Commercial Lunar Payload Services) initiative to support the first phase of the agency's moon base plans, and the landers announced today will be some of the first in that lineup.

The Vera C. Rubin Observatory has begun its 10-year Legacy Survey of Space and Time, using the world's largest digital camera to image the entire southern sky every few nights. The project is expected to catalog billions of stars and galaxies, track changing and transient objects, and generate an enormous dataset for studying dark matter, galaxy formation, asteroids, and unexpected cosmic phenomena. The New York Times reports: "This is the end of a 30-year wait," said Phil Marshall, the deputy director of the telescope's operations at SLAC National Accelerator Laboratory in California, in a statement to The New York Times. "It's a major milestone for us." Astronomers expect this collection of data, known as the Legacy Survey of Space and Time, to revolutionize their knowledge of our galaxy's birth, the invisible matter permeating the cosmos, what shaped the universe into the structure it has today and more. According to Dr. Marshall, the survey is designed to see everything, "even the things we don't know we're looking for yet," he said.

The team behind the observatory, a joint effort funded by the U.S. Department of Energy and the National Science Foundation, unveiled several images of the cosmos that were jampacked with celestial goodness -- a peek at what the Rubin could do -- last year. Since then, scientists have been busy conducting final tests and reviews of the telescope's operations and systems. According to Bob Blum, the director of Rubin operations at the National Optical-Infrared Astronomy Research Laboratory, the team has also been hard at work ensuring that the telescope can operate reliably in different environmental conditions for the next decade.