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Robotics

Public Servants Uneasy As Government 'Spy' Robot Prowls Federal Offices (www.cbc.ca) 72

An anonymous reader quotes a report from CBC News: A device federal public servants call "the little robot" began appearing in Gatineau office buildings in March. It travels through the workplace to collect data using about 20 sensors and a 360-degree camera, according to Yahya Saad, co-founder of GlobalDWS, which created the robot. "Using AI on the robot, the camera takes the picture, analyzes and counts the number of people and then discards the image," he said. Part of a platform known as VirBrix, the robot also gathers information on air quality, light levels, noise, humidity, temperature and even measures CO2, methane and radon gas. The aim is to create a better work environment for humans -- one that isn't too hot, humid or dim. Saad said that means more comfortable and productive employees. The technology can also help reduce heating, cooling and hydro costs, he said. "All these measures are done to save on energy and reduce the carbon footprint," Saad explained. After the pilot program in March, VirBrix is set to return in July and October, and the government hasn't ruled out extending its use. It's paying $39,663 to lease the robot for two years.

Bruce Roy, national president of the Government Services Union, called the robot's presence in federal workplaces "intrusive" and "insulting." "People feel observed all the time," he said in French. "It's a spy. The robot is a spy for management." Roy, whose union represents more than 12,000 federal workers across several departments, said the robot is unnecessary because the employer already has ways of monitoring employee attendance and performance. "We believe that one of the robot's tasks is to monitor who is there and who is not," he said. "Folks say, why is there a robot here? Doesn't my employer trust that I'm here and doing my work properly?" [...] Jean-Yves Duclos, the minister of public services and procurement, said the government is instead using the technology as it looks to cut its office space footprint in half over the coming years. "These robots, as we call them, these sensors observe the utilization of office space and will be able to give us information over the next few years to better provide the kind of workplace employees need to do their job," Duclos said in French. "These are totally anonymous methods that allow us to evaluate which spaces are the most used and which spaces are not used, so we can better arrange them."
"In those cases we keep the images, but the whole body, not just the face, the whole body of the person is blurred," said Saad. "These are exceptional cases where we need to keep images and then the images would be handed over to the client."

The data is then stored on a server on Canadian soil, according to GlobalDWS.
Earth

Satellite 'Megaconstellations' May Jeopardize Recovery of Ozone Hole (phys.org) 90

An anonymous reader quotes a report from Phys.Org: When old satellites fall into Earth's atmosphere and burn up, they leave behind tiny particles of aluminum oxide, which eat away at Earth's protective ozone layer. A new study finds that these oxides have increased 8-fold between 2016 and 2022 and will continue to accumulate as the number of low-Earth-orbit satellites skyrockets. The 1987 Montreal Protocol successfully regulated ozone-damaging CFCs to protect the ozone layer, shrinking the ozone hole over Antarctica with recovery expected within fifty years. But the unanticipated growth of aluminum oxides may push pause on the ozone success story in decades to come. Of the 8,100 objects in low Earth orbit, 6,000 are Starlink satellites launched in the last few years. Demand for global internet coverage is driving a rapid ramp up of launches of small communication satellite swarms. SpaceX is the frontrunner in this enterprise, with permission to launch another 12,000 Starlink satellites and as many as 42,000 planned. Amazon and other companies around the globe are also planning constellations ranging from 3,000 to 13,000 satellites, the authors of the study said. Internet satellites in low Earth orbit are short-lived, at about five years. Companies must then launch replacement satellites to maintain internet service, continuing a cycle of planned obsolescence and unplanned pollution.

Aluminum oxides spark chemical reactions that destroy stratospheric ozone, which protects Earth from harmful UV radiation. The oxides don't react chemically with ozone molecules, instead triggering destructive reactions between ozone and chlorine that deplete the ozone layer. Because aluminum oxides are not consumed by these chemical reactions, they can continue to destroy molecule after molecule of ozone for decades as they drift down through the stratosphere. Yet little attention has yet been paid to pollutants formed when satellites fall into the upper atmosphere and burn. Earlier studies of satellite pollution largely focused on the consequences of propelling a launch vehicle into space, such as the release of rocket fuel. The new study, by a research team from the University of Southern California Viterbi School of Engineering, is the first realistic estimate of the extent of this long-lived pollution in the upper atmosphere, the authors said. [...]

In 2022, reentering satellites increased aluminum in the atmosphere by 29.5% over natural levels, the researchers found. The modeling showed that a typical 250-kilogram (550-pound) satellite with 30% of its mass being aluminum will generate about 30 kilograms (66 pounds) of aluminum oxide nanoparticles (1-100 nanometers in size) during its reentry plunge. Most of these particles are created in the mesosphere, 50-85 kilometers (30-50 miles) above Earth's surface. The team then calculated that based on particle size, it would take up to 30 years for the aluminum oxides to drift down to stratospheric altitudes, where 90% of Earth's ozone is located. The researchers estimated that by the time the currently planned satellite constellations are complete, every year, 912 metric tons of aluminum (1,005 U.S. tons) will fall to Earth. That will release around 360 metric tons (397 U.S. tons) of aluminum oxides per year to the atmosphere, an increase of 646% over natural levels.
The study is published in the journal Geophysical Research Letters.
Space

Astronomers Detect Sudden Awakening of Black Hole For First Time (theguardian.com) 20

Astronomers are observing the sudden awakening of a giant black hole in the constellation of Virgo. "Decades of observations found nothing remarkable about the distant galaxy in the constellation of Virgo, but that changed at the end of 2019 when astronomers noticed a dramatic surge in its luminosity that persists to this day," reports The Guardian. "Researchers now believe they are witnessing changes that have never been seen before, with the black hole at the galaxy's core putting on an extreme cosmic light show as vast amounts of material fall into it." From the report: The galaxy, which goes by the snappy codename SDSS1335+0728 and lies 300m light years away, was flagged to astronomers in December 2019 when an observatory in California called the Zwicky Transient Facility recorded a sudden rise in its brightness. The alert prompted a flurry of new observations and checks of archived measurements from ground- and space-based telescopes to understand more about the galaxy and its past behavior.

The scientists discovered the galaxy had recently doubled in brightness in mid-infrared wavelengths, become four times brighter in the ultraviolet, and at least 10 times brighter in the X-ray range. What triggered the sudden brightening is unclear, but writing in Astronomy and Astrophysics, the researchers say the most likely explanation is the creation of an "active galactic nucleus" where a vast black hole at the centre of a galaxy starts actively consuming the material around it.

Active galactic nuclei emit a broad spectrum of light as gas around the black hole heats up and glows, and surrounding dust particles absorb some wavelengths and re-radiate others. But it is not the only possibility. The team has not ruled out an exotic form of "tidal disruption event," a highly restrained phrase to describe a star that is ripped apart after straying too close to a black hole. Tidal disruption events tend to be brief affairs, brightening a galaxy for no more than a few hundred days, but more measurements are needed to rule out the process.

AMD

AMD Is Investigating Claims That Company Data Was Stolen In Hack (hackread.com) 6

AMD said on Tuesday it was looking into claims that company data was stolen in a hack by a cybercriminal organization called "Intelbroker". "The alleged intrusion, which took place in June 2024, reportedly resulted in the theft of a significant amount of sensitive information, spanning across various categories," reports Hackread. From the report: In a recent post on Breach Forums, IntelBroker detailed the extent of the compromised data. The hacker claims to have accessed information related to the following records: ROMs, Firmware, Source code, Property files, Employee databases, Customer databases, Financial information, Future AMD product plans, and Technical specification sheets. The hacker is selling the data exclusively for XMR (Monero) cryptocurrency, accepting a middleman for transactions. He advises interested buyers to message him with their offers.

The reputation of IntelBroker in the cybersecurity community is one of significant concern, given the scale and sensitivity of the targeted entities in previous hacks. The hacker's past exploits include breaches of: Europol, Tech in Asia, Space-Eyes, Home Depot, Facebook Marketplace, U.S. contractor Acuity Inc., Staffing giant Robert Half, Los Angeles International Airport, and Alleged breaches of HSBC and Barclays Bank. Although the hacker's origins and affiliates are unknown, according to the United States government, IntelBroker is alleged to be the perpetrator behind one of the T-Mobile data breaches.

Supercomputing

$2.4 Million Texas Home Listing Boasts Built-In 5,786 sq ft Data Center (tomshardware.com) 34

A Zillow listing for a $2.4 million house in a Dallas suburb is grabbing attention for its 5,786-square-foot data center with immersion cooling tanks, massive server racks, and two separate power grids. Tom's Hardware reports: With a brick exterior, cute paving, and mini-McMansion arch stylings, the building certainly looks to be a residential home for the archetypal Texas family. Prospective home-buyers will thus be disappointed by the 0 bedroom, 1 bathroom setup, which becomes a warehouse-feeling office from the first step inside where you are met with a glass-shielded reception desk in a white-brick corridor. The "Crypto Collective" branding betrays the former life of the unit, which served admirably as a crypto mining base.

The purchase of the "upgraded turnkey Tier 2 Data Center" will include all of its cooling and power infrastructure. Three Engineered Fluids "SLICTanks," single-phase liquid immersion cooling tanks for use with dielectric coolant, will come with pumps and a 500kW dry cooler. The tanks are currently filled with at least 80 mining computers visible from the photos, though the SLICTanks can be configured to fit more machines. Also visible in proximity to the cooling array is a deep row of classic server racks and a staggering amount of networking.

The listing advertises a host of potential uses for future customers, from "AI services, cloud hosting, traditional data center, servers or even Bitcoin Mining". Also packed into the 5,786 square feet of real estate is two separate power grids, 5 HVAC units, a hefty amount of four levels of warehouse-style storage aisles, a lounge/office space, and a fully-paved backyard. In other good news, its future corporate residents will not have an HOA to deal with, and will only be 20 minutes outside of the heart of Dallas, sitting just out of earshot of two major highways.

NASA

In Memoriam: Dr. Ed Stone, Former NASA JPL Director and Voyager Project Scientist (nasa.gov) 9

Slashdot reader hackertourist shared this announcement from NASA's Jet Propulsion Laboratory: Edward C. Stone, former director of NASA's Jet Propulsion Laboratory and project scientist of the Voyager mission for 50 years, died on June 9, 2024. He was age 88...

Stone served on nine NASA missions as either principal investigator or a science instrument lead, and on five others as a co-investigator (a key science instrument team member). These roles primarily involved studying energetic ions from the Sun and cosmic rays from the galaxy. He had the distinction of being one of the few scientists involved with both the mission that has come closest to the Sun (NASA's Parker Solar Probe) and the one that has traveled farthest from it (Voyager).

Stone is best known for his work on NASA's longest-running mission, Voyager, whose twin spacecraft launched in 1977 and are still exploring deep space today. He served as Voyager's sole project scientist from 1972 until his retirement in 2022. Under Stone's leadership, the mission took advantage of a celestial alignment that occurs just once every 176 years to visit Jupiter, Saturn, Uranus, and Neptune. During their journeys, the spacecraft revealed the first active volcanoes beyond Earth, on Jupiter's moon Io, and an atmosphere rich with organic molecules on Saturn's moon Titan. Voyager 2 remains the only spacecraft to fly by Uranus and Neptune, revealing Uranus' unusual tipped magnetic poles, and the icy geysers erupting from Neptune's moon Triton.

The mission "transformed our understanding of the solar system, and is still providing useful data today," writes hackertourist. (Watch Stone speak in this 2018 video about the Voyager 2 spacecraft.) NASA's announcement also includes stories of Stone's desire to engage the public and his thoughtfulness in considering the true boundary of interstellar space. As director of JPL, Stone was responsible for more than two dozen other missions, including landing NASA's Pathfinder mission with the first Mars rover in 1996. "Ed Stone was a trailblazer who dared mighty things in space. He was a dear friend to all who knew him, and a cherished mentor to me personally," said Nicola Fox, associate administrator for the Science Mission Directorate at NASA Headquarters in Washington.

"Ed took humanity on a planetary tour of our solar system and beyond, sending NASA where no spacecraft had gone before. His legacy has left a tremendous and profound impact on NASA, the scientific community, and the world."
Space

Is There Life on This Saturn Moon? Scientists Plan a Mission to Find Out (theguardian.com) 52

It's one of Saturn's 146 moons — just 310 miles in diameter (or 498 kilometers). Yet the European Space Agency plans to send a robot on a one-billion mile trip to visit it. Why?

Because astronomers have discovered Enceladus "possesses geysers that regularly erupt from its surface and spray water into space," reports the Guardian: Even more astonishing, these plumes contain complex organic compounds, including propane and ethane. "Enceladus has three key ingredients that are considered to be essential for the appearance of life," said astronomer Professor Michele Dougherty of Imperial College London. "It has got liquid water, organic material and a source of heat. That combination makes it my favourite moon in the whole solar system."
A panel of expert scientists have now recommended the Saturn moon for an ESA mission by 2040, according to the article, "with the aim of either landing on the moon or flying through the geysers spraying water and carbon chemicals from its surface into space. Preferably, both goals would be attempted, the panel added."

It will be tricky. Dougherty warns that Enceladus "is small with weak gravity, which means you will need a lot of fuel to slow it down so that it does not whiz past its target into deep space. That is going to be a tricky issue for those designing the mission." But Dougherty has a special interest, as the principal investigator for the magnetometer flown on the Cassini mission that studied Saturn and its moons between 2004 and 2017. "At one point, Cassini passed close to Enceladus and our instrument indicated Saturn's magnetic field was being dragged round the moon in a way that suggested the little moon had an atmosphere," said Dougherty. Cassini's managers agreed to direct the probe to take a closer look and, in July 2005, the spaceship swept over the moon's surface at a height of 173km — and detected significant amounts of water vapour. "It was wonderful," recalls Dougherty.

Subsequent sweeps produced even greater wonders. Huge geysers of water were pictured erupting from geological fault lines at the south pole. The only other body in the solar system, apart from Earth, possessing liquid water on its surface had been revealed. Finally came the discovery of organics in those plumes and Enceladus went from being rated a minor, unimportant moon to a world that is now set to trigger the expenditure of billions of euros and decades of effort by European astronomers and space engineers.

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

Have Scientists Found 'Potential Evidence' of Dyson Spheres? (cnn.com) 67

Have scientists discovered infrared radiation, evidence of waste heat generated by the energy-harvesting star-surrounding spheres first proposed by British American physicist Freeman Dyson? CNN reports: [A] new study that looked at 5 million stars in the Milky Way galaxy suggests that seven candidates could potentially be hosting Dyson spheres — a finding that's attracting scrutiny and alternate theories... Using historical data from telescopes that pick up infrared signatures, the research team looked at stars located within less than 1,000 light-years from Earth: "We started with a sample of 5 million stars, and we applied filters to try to get rid of as much data contamination as possible," said lead study author Matías Suazo, a doctoral student in the department of physics and astronomy of Uppsala University in Sweden. "So far, we have seven sources that we know are glowing in the infrared but we don't know why, so they stand out...."

Among the natural causes that could explain the infrared glow are an unlucky alignment in the observation, with a galaxy in the background overlapping with the star, planetary collisions creating debris, or the fact that the stars may be young and therefore still surrounded by disks of hot debris from which planets would later form...

An earlier study, published in March and using data from the same sources as the new report, had also found infrared anomalies among a sample dataset of 5 million stars in our galaxy. "We got 53 candidates for anomalies that cannot be well explained, but can't say that all of them are Dyson sphere candidates, because that's not what we are specifically looking for," said Gabriella Contardo, a postdoctoral research fellow at the International School for Advanced Studies in Trieste, Italy, who led the earlier study. She added that she plans to check the candidates against Suazo's model to see how many tie into it. "You need to eliminate all other hypotheses and explanations before saying that they could be a Dyson sphere," she added. "To do so you need to also rule out that it's not some kind of debris disk, or some kind of planetary collision, and that also pushes the science forward in other fields of astronomy — so it's a win-win."

Both Contardo and Suazo agree that more research is needed on the data, and that ultimately they could turn to NASA's James Webb Space Telescope for more information, as it is powerful enough to observe the candidate stars directly. However, because of the lengthy, competitive procedures that regulate use of the telescope, securing access might take some time.


CNN adds that "A May 23 paper published in response to the one by Suazo and his colleagues suggests that at least three of the seven stars have been 'misidentified' as Dyson spheres and could instead be 'hot DOGs' — hot dust-obscured galaxies — and that the remaining four could probably be explained this way as well."

But "As for Dyson himself, if he were still alive, he also would be highly skeptical that these observations represent a technological signature, his son George argued: 'But the discovery of new, non-technological astronomical phenomena is exactly why he thought we should go out and look.' "
Programming

Rust's Foundation Announces a New 'Safety-Critical Rust Consortium' (rust-lang.org) 26

This week the Rust Foundation jointly announced "the Safety-Critical Rust Consortium" with industry partners including Arm, AdaCore, Lynx Software Technologies, and Toyota's mobility tech subsidiary Woven. Its goal is supporting "responsible use" of Rust "in safety-critical software — systems whose failure can impact human life or cause severe environmental or property harm."

"This is exciting," said Rust creator Graydon Hoare in a statement. "I am truly pleased to see the Rust Foundation and anyone in the safety-critical space coming together on this topic."

From the announcement: "Safety is our foremost priority in vehicle software development. Traditionally, achieving the highest levels of safety has been a complex and lengthy endeavor, requiring the use of specialized tools and processes beyond the programming language," said JF Bastien, Distinguished Engineer at Woven by Toyota. "We are therefore pleased to collaborate with leading experts in the safety industry to integrate new tools such as Rust into our safety-critical systems...." Industries that are particularly concerned with functional safety include transportation (such as automotive, aviation, space), energy, life sciences, and more. Because of their potential impacts, these industries are often regulated, have liability considerations, and are guided by standards... These industries have decades of experience delivering products, learning from iterating based on real-world feedback, and improving processes. An ecosystem of tools and tool vendors have evolved, and best practices have been learned to create a safety culture around tooling.

Rust offers particular advantages in terms of developer ergonomics, productivity and software quality; however, it lacks a deep and established well of safety-processes and collective industry knowledge of safety-critical systems. Without closing this gap, a developer must primarily rely on best practices and normative precautions, which can limit innovation. Rust developers who stray from the well-trod path can find themselves facing an inquiry were an accident to occur. In these circumstances, anything that seems unusual will be investigated for fault.

This risk creates a disincentive to widespread Rust adoption, leaving developers unable to reap all its advantages while potentially facing financial, reputational and moral costs. The gap in safety-critical resources within the Rust programming language ecosystem is also an exciting opportunity. By rapidly incorporating lessons learned from years of careful development and past mistakes in the wider open source ecosystem, Rust can become a valuable component of a safety toolkit adaptable to various safety-critical industries and severity levels.

"Work under the consortium will begin with the creation of a public charter and goals," according to the announcement, with a scope possibly including "the development of guidelines, linters, libraries, static analysis tools, formal methods and language subsets to meet industrial and legal requirements. The group may further shepherd Rust Foundation-funded implementation work, including grants to existing academic teams or FOSS projects... The group will further attempt to coordinate with and expand on existing safety-critical projects and standards including SAE JA1020.
The group will maintain communication with the larger Rust Project, and "The Consortium's deliverables will be developed and licensed in a manner compatible with other Rust Project endeavors."
NASA

Voyager 1 Returns To Normal Science Operations (theregister.com) 50

wgoodman shares a report from The Register: NASA's Voyager 1 spacecraft is back in action and conducting normal science operations for the first time since the veteran probe began spouting gibberish at the end of 2023. All four of the spacecraft's remaining operational instruments are now returning usable data to Earth, according to NASA. Some additional work is needed to tidy up the effects of the issue. Engineers need to resynchronize the timekeeping software of Voyager 1's three onboard computers to ensure that commands are executed at the correct times. Maintenance will also be performed on the digital tape recorder, which records some data from the plasma instrument for a six-monthly downlink to Earth.

Voyager 1's woes began in November 2023, when the spacecraft stopped transmitting usable data back to Earth. Rather than engineering and science data, NASA found itself faced with a repeating pattern of ones and zeroes, as though the spacecraft was somehow stalled. Engineers reckoned the issue lay with the Flight Data System (FDS) and in March sent a command -- dubbed a "poke" -- to get the FDS to try some other software sequences and thus circumvent whatever was causing the problem. The result was a complete memory dump from the computer, which allowed engineers to pinpoint where the corruption had occurred. It appeared that a single chip was malfunctioning, and engineers were faced with the challenge of devising a software update that would work around the defective hardware.

Usable engineering data began to be returned later in April, and in May the mission team sent commands to instruct the probe to keep science data flowing. The result was that the plasma wave subsystem and magnetometer instrument began sending data immediately. According to NASA, the cosmic ray subsystem and low energy charged particle instrument required a little more tweaking but are now operational. The rescue was made all the more impressive by the fact that it takes 22.5 hours for a command to reach Voyager 1 and another 22.5 hours for a response to be received on Earth.

Space

Blue Origin Joins SpaceX, ULA In Winning Bids For $5.6 Billion Pentagon Rocket Program (cnbc.com) 32

The Pentagon announced the first winners of its $5.6 billion National Security Space Launch program, with Jeff Bezos' Blue Origin securing a spot for the first time alongside Elon Musk's SpaceX and United Launch Alliance (ULA). These companies will compete for contracts through mid-2029 under the program's Phase 3, which is expected to include 90 rocket launch orders. CNBC reports: Under the program, known as NSSL Phase 3 Lane 1, the trio of companies will be eligible to compete for contracts through mid-2029. ULA and SpaceX have already been competing for contracts under the previous Phase 2 edition of NSSL: In total, over five years of Phase 2 launch orders, the military assigned ULA with 26 missions worth $3.1 billion, while SpaceX got 22 missions worth $2.5 billion. Blue Origin, as well as Northrop Grumman, missed out on Phase 2 when the Pentagon selected ULA and SpaceX for the program in August 2020. But with Phase 3, the U.S. military is raising the stakes -- and widening the field -- on a high-profile competition for Space Force mission contracts. Phase 3 is expected to see 90 rocket launch orders in total, with a split approach of categories Lane 1 and Lane 2 to allow even more companies to bid.
ISS

NASA Accidentally Broadcasts Simulation of Distressed Astronauts On ISS (reuters.com) 23

An anonymous reader quotes a report from Reuters: NASA accidentally broadcast a simulation of astronauts being treated for decompression sickness on the International Space Station (ISS) on Wednesday, prompting speculation of an emergency in posts on social media. About 5:28 p.m. U.S. Central Time (2228 GMT), The National Aeronautics and Space Administration's (NASA) live YouTube channel broadcast audio that indicated a crew member was experiencing the effects of decompression sickness (DCS), NASA said on its official ISS X account.

A female voice asks crew members to "get commander back in his suit", check his pulse and provide him with oxygen, later saying his prognosis was "tenuous", according to copies of the audio posted on social media. NASA did not verify the recordings or republish the audio. Several space enthusiasts posted a link to the audio on X with warnings that there was a serious emergency on the ISS. "This audio was inadvertently misrouted from an ongoing simulation where crew members and ground teams train for various scenarios in space and is not related to a real emergency," the ISS account post said. "There is no emergency situation going on aboard the International Space Station," it added.

Crew members on the ISS were in their sleep period at the time of the audio broadcast as they prepared for a spacewalk at 8 a.m. EDT on Thursday, the ISS post said. NASA's ISS YouTube channel -- at the time the audio was accidentally broadcast -- now shows an error message saying the feed has been interrupted.

Space

Wild New Study Suggests Gravity Can Exist Without Mass (sciencealert.com) 120

A new study by astrophysicist Richard Lieu suggests that gravity can exist without mass, proposing thin, shell-like layers of 'topological defects' as an alternative to dark matter for explaining the gravitational binding of galaxies. This theory posits that these defects create a gravitational force without detectable mass, potentially eliminating the need for dark matter in current cosmological models. Clare Watson reports via ScienceAlert: Lieu started out trying to find another solution to the Einstein field equations, which relate the curvature of space-time to the presence of matter within it. As Einstein described in his 1915 theory of general relativity, space-time warps around bundles of matter and streams of radiation in the Universe, depending on their energy and momentum. That energy is, of course, related to mass in Einstein's famous equation: E=mc2. So an object's mass is linked to its energy, which bends space-time -- and this curvature of space-time is what Einstein described as gravity, a notch more sophisticated than Newton's 17th-century approximation of gravity as a force between two objects with mass. In other words, gravity seems inextricably linked to mass. Not so, posits Lieu.

In his workings, Lieu set about solving a simplified version of the Einstein field equations that allows for a finite gravitation force in the absence of any detectable mass. He says his efforts were "driven by my frustration with the status quo, namely the notion of dark matter's existence despite the lack of any direct evidence for a whole century." Lieu's solution consists of shell-shaped topological defects that might occur in very compact regions of space with a very high density of matter. These sets of concentric shells contain a thin layer of positive mass tucked inside an outer layer of negative mass. The two masses cancel each other out, so the total mass of the two layers is exactly zero. But when a star lies on this shell, it experiences a large gravitational force dragging it towards the center of the shell. "The contention of my paper is that at least the shells it posits are massless," Lieu says. If those contentious suggestions bear any weight, "there is then no need to perpetuate this seemingly endless search for dark matter," Lieu adds.

The next question, then, is how to possibly confirm or refute the shells Lieu has proposed through observations. "The increasing frequency of sightings of ring and shell-like formation of galaxies in the Universe lends evidence to the type of source being proposed here," Lieu writes in his paper. Although he admits that his proposed solution is "highly suggestive" and cannot alone discredit the dark matter hypothesis. "It could be an interesting mathematical exercise at best," Lieu concludes. "But it is the first [mathematical] proof that gravity can exist without mass."
The study has been published in Monthly Notices of the Royal Astronomical Society.
Open Source

OIN Expands Linux Patent Protection Yet Again (But Not To AI) (zdnet.com) 7

Steven Vaughan-Nichols reports via ZDNet: While Linux and open-source software (OSS) are no longer constantly under intellectual property (IP) attacks, the Open Invention Network (OIN) patent consortium still stands guard over its patents. Now, OIN, the largest patent non-aggression community, has expanded its protection once again by updating its Linux System definition. Covering more than just Linux, the Linux System definition also protects adjacent open-source technologies. In the past, protection was expanded to Android, Kubernetes, and OpenStack. The OIN accomplishes this by providing a shared defensive patent pool of over 3 million patents from over 3,900 community members. OIN members include Amazon, Google, Microsoft, and essentially all Linux-based companies.

This latest update extends OIN's existing patent risk mitigation efforts to cloud-native computing and enterprise software. In the cloud computing realm, OIN has added patent coverage for projects such as Istio, Falco, Argo, Grafana, and Spire. For enterprise computing, packages such as Apache Atlas and Apache Solr -- used for data management and search at scale, respectively -- are now protected. The update also enhances patent protection for the Internet of Things (IoT), networking, and automotive technologies. OpenThread and packages such as agl-compositor and kukusa.val have been added to the Linux System definition. In the embedded systems space, OIN has supplemented its coverage of technologies like OpenEmbedded by adding the OpenAMP and Matter, the home IoT standard. OIN has included open hardware development tools such as Edalize, cocotb, Amaranth, and Migen, building upon its existing coverage of hardware design tools like Verilator and FuseSoc.

Keith Bergelt, OIN's CEO, emphasized the importance of this update, stating, "Linux and other open-source software projects continue to accelerate the pace of innovation across a growing number of industries. By design, periodic expansion of OIN's Linux System definition enables OIN to keep pace with OSS's growth." [...] Looking ahead, Bergelt said, "We made this conscious decision not to include AI. It's so dynamic. We wait until we see what AI programs have significant usage and adoption levels." This is how the OIN has always worked. The consortium takes its time to ensure it extends its protection to projects that will be around for the long haul. The OIN practices patent non-aggression in core Linux and adjacent open-source technologies by cross-licensing their Linux System patents to one another on a royalty-free basis. When OIN signees are attacked because of their patents, the OIN can spring into action.

Space

Indian Startup 3D Prints Rocket Engine in Just 72 Hours (ieee.org) 53

cusco writes: Indian space startup Agnikul used a 3-D printer from German company EOS to print an engine out of inconel, a high-performance nickel-chromium alloy, in one solid piece over the course of roughly 72 hours. While other companies like Relativity Space and Rocket Lab are using 3-D printers extensively, Agnikul's engine is unique in being printed in one go, rather than as multiple components that need to be stitched together. This approach significantly speeds up manufacturing time.

The single-engine technology demonstration rocket produced 6 kilonewtons of thrust and reached an altitude of 6.5 kilometers before splashing down into the ocean. The launch vehicle used was about 6 meters tall with a single engine, making it roughly equivalent to the second stage of the company's planned commercial product, Agnibaan. Agnibaan will be a two-stage rocket, 18 meters tall, featuring eight engines in total, and capable of carrying a 300-kilogram payload to an altitude of around 700 km. The company believes that their 3D printing approach opens the door to providing low-cost, "on-demand" launch services to operators of small satellites.

IEEE Spectrum adds: Assembling the rest of the rocket and integrating the engine took roughly two weeks. The company says that opens the door to providing low-cost, "on-demand" launch services to operators of small satellites, which otherwise need to wait for a ride share on a bigger rocket. The big challenge now will be going from a single engine to a cluster of seven on Agnibaan's first stage, says cofounder and CEO Srinath Ravichandran. This raises all kinds of challenges, from balancing thrust across the engines at lift-off to managing engine plume interactions when the engines gimbal to alter the trajectory. "But these are problems that people have figured out," he says. "We believe that we should just be able to fine-tune it for our mission and go." The company is currently building facilities to carry out ground tests of engine clusters, says Ravichandran, and is targeting its first orbital launch for this time next year.

Space

Stoke Space Scores a Success In First Test Firing of Engine For Reusable Nova Booster (geekwire.com) 26

Kent, Wash.-based Stoke Space successfully completed the first hot-fire test of its reusable Nova launch vehicle's first-stage engine, which reached 350,000 hp in under a second during a two-second test on June 5. GeekWire reports: During the two-second test, the engine ramped up to its target starting power level, producing the equivalent of 350,000 hp in less than a second, and held that power level until shutdown. At full power, the full-flow staged combustion engine is designed to produce over 100,000 pounds of thrust. The rocket engine was designed and manufactured in just 18 months. The medium-lift Nova rocket's first-stage booster will be powered by seven of the engines.

Stoke successfully conducted a vertical-takeoff-and-landing test flight of its reusable second stage last September. Since then, the company has been focusing on first-stage development. For the rest of this year, Stoke expects to continue maturing its engine and vehicle design while scaling operations for orbital launch. Stoke Space said last year that it was targeting 2025 for its first orbital test flight -- but that timetable depends on progress in the development program.

Businesses

Best Buy Is Laying Off More Employees As It Reckons With Falling Sales (theverge.com) 139

According to The Verge, Best Buy conducted another round of layoffs and job restructurings to "right size" the business in response to declining sales post-pandemic. Further layoffs and changes are expected throughout the year. From the report: The layoffs appeared to have mostly targeted in-home sales roles called designers, who would go to customers' homes to help identify products that would work in their space. It's not clear how many were let go, but designers who weren't laid off have been moved into a different, largely in-store role. Also, pay scales for a similar, existing in-store "consultant" position were revamped. Best Buy confirmed the layoffs in an email to The Verge but declined to share how many people were let go or how pay was changing. "Many of our team members were moved to new areas or roles where our customers need it most," Best Buy spokesperson Ryan Furlong told The Verge. He said some employees in Best Buy's "Design and Consult workforce" -- the collection of roles with in-store workers (called consultants) and in-home field sales positions (called designers) -- will be transitioned into a new "Premium Designer role."

Best Buy has been drastically restructuring in recent months, responding to factors like falling sales after the pandemic spiked consumer electronics spending. Best Buy CEO Corie Barry told investors in February that they should expect layoffs this year, and two months ago, mass layoffs of Geek Squad employees were reported. Barry repeated similar things during the company's first quarter earnings call in May, saying that many of Best Buy's moves to "right size" its business "are being implemented throughout this year."

Mars

Early Morning Frost Spotted On Some of Mars' Huge Mountains (theguardian.com) 50

Scientists have discovered early morning frost on the summits of Martian volcanoes near the planet's equator, indicating that water ice forms overnight in colder months and evaporates after sunrise. "While the frosty layer is exceptionally thin, it covers an enormous area," reports The Guardian. "Scientists calculate that in the more frigid Martian seasons, 150,000 tons of water, equivalent to 60 Olympic swimming pools, condense daily on the tops of the towering mountains." From the report: "It's the first time we've discovered water frost on the volcano summits and the first time we've discovered water frost in the equatorial regions of Mars," said Adomas Valantinas, a planetary scientist at the University of Berne in Switzerland and Brown University in the US. "What we're seeing could be a trace of a past Martian climate," Valantinas said of the frost-tipped volcanoes. "It could be related to atmospheric climate processes that were operating earlier in Martian history, maybe millions of years ago."

Valantinas spotted the frost-capped volcanoes in high-resolution colour images snapped in the early morning hours on Mars by the European Space Agency's Trace Gas Orbiter (TGO). With colleagues, he confirmed the discovery using a spectrometer on TGO and further images taken by the agency's Mars Express orbiter. The frost appears as a bluish hue on the caldera floors and is absent from well-lit slopes. [...] [W]riting in Nature Geoscience, the researchers describe how Martian winds may blow up the mountainsides and carry more moist air into the calderas where it condenses and settles as frost at particular times of year. Modeling of the process suggests the frost is water ice as the peaks are not cold enough for carbon dioxide frost to form.

Space

SpaceX Hopes to Eventually Build One Starship Per Day at Its Texas 'Starfactory' (space.com) 305

SpaceX's successful launch (and reentry) of Starship was just the beginning, reports Space.com: SpaceX now aims to build on the progress with its Starship program as continues work on Starfactory, a new manufacturing facility under construction at the company's Starbase site in South Texas... "When you step into this factory, it is truly inspirational. My heart jumps out of my chest," Kate Tice, manager of SpaceX Quality Systems Engineering, said [during SpaceX's livestream of the Starship flight test]. "Now this will enable us to increase our production rate significantly as we build toward our long-term goal of producing one Ship per day and coming off the production line soon, Starship Version Two."

This new version of Starship is designed to be more easy to mass produce, SpaceX CEO Elon Musk said on social media.

Space.com argues that the long-term expansion comes as SpaceX "looks to use Starship to eventually make humanity interplanetary."
Space

Virgin Galactic Completes Final 'Space Tourists and Research' Flight Before Two-Year Pause (space.com) 12

"Virgin Galactic launched six people to suborbital space on Saturday, launching a Turkish astronaut and three space tourists," reports Space.com, "on what was the final voyage of the VSS Unity space plane." Unity, attached to the belly of its carrier plane Eve, took off from runway at Spaceport America in New Mexico at 10:31 a.m. EDT (1431 GMT) and carried to an altitude of 44,562 feet (13,582 meters) over the next hour, where it was dropped and ignited its rocket engine to carry two pilots and four passengers to space and back. The mission, called Galactic 07, reached an altitude of 54.4 miles (87.5 km) and marked the seventh commercial spaceflight by Virgin Galactic on Unity, which is being retired to make way for the company's new "Delta" class of spacecraft rolling out in 2026.

"I will need much more time to try and process what just happened," Tuva Atasever, the Turkish Space Agency astronaut on the flight, said in a post-flight press conference, adding that the view of Earth was indescribable. "It's not something you can describe with adjectives. It's an experiential thing ... you just feel it in your gut."

One of the space tourists was a principal propulsion engineer at SpaceX, who wore the flags of the U.S. and India on his spacesuit to honor both his home country and that of his parents. The other two were a New York-based real estate developer and a London-based hotel and resort investment strategy advisor.

The flight landed 70 minutes later at 11:41 a.m. EDT (1541 GMT), according to the article, "marking only its seventh commercial spaceflight for Virgin Galactic and 12th crewed spaceflight overall." In all, Virgin Galactic flew the space plane just 32 times, including non-space test flights... "This vehicle was revolutionary," Virgin Galactic president Mike Moses said in the post-launch press conference. "We tested it, we flew it, we demonstrated and prove to the world that commercial human spaceflight is possible with private funding for private companies... Seven commercial space flights, a single vehicle flying six times in six months last year, that's groundbreaking," Moses said. "The fact that we can take this vehicle back to back to back on a monthly basis is is really revolutionary."

The new Delta class of spacecraft will be able to fly at least twice a week, about eight times the rate of SpaceShipTwo, with Virgin Galactic planning to build at least two to start its new fleet. "We're going to field in 2026 two spaceships, our mothership Eve, that's 750 astronauts a year going to space," Moses said of the new fleet's flight capacity. "That's more than have gotten to space in the 60 year history of spaceflight to date...."

Since 2018, Virgin Galactic has flown payloads as part of NASA's Flight Opportunities program and most recently was selected to be a contracted flight provider for NASA for the next five years.

Phys.org reports that with the Delta-class rockets, "The future of the company is at stake as it seeks at long last to get into the black. Virgin is burning through cash, losing more than $100 million in each of the past two quarters, with its reserves standing at $867 million at the end of March." It also laid off 185 people, or 18 percent of its workforce, late last year. Its shares are currently trading at 85 cents, down from $55 in 2021, the year Branson himself flew, garnering global headlines.
Saturday's flight also became "a suborbital science lab" for microgravity research, according to a statement from the company. Phys.org reports that during the flight, astronaut Atasever "wore custom headgear with brain activity monitoring sensors to collect physiological data, a dosimeter, and two commercially available insulin pens to examine the ability to administer accurate insulin doses in microgravity, Virgin said in a statement." And Virgin Galactic said their flight also carried "rack-mounted" autonomous payloads from both Purdue ("to study propellant slosh in fuel tanks of maneuvering spacecraf") and U.C. Berkeley ("testing a new type of 3D printing"), as well as "multiple human-tended experiments." "Discovery and innovation are central to our mission at Virgin Galactic," said Michael Colglazier, CEO of Virgin Galactic. "We're excited to build on our successful record of facilitating scientific experiments in suborbital space, and we look forward to continuing to expand our role in suborbital research going forward."

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