Three mathematicians have developed a breakthrough method for proving whether numbers can be written as fractions, solving a problem that has puzzled researchers for decades. Frank Calegari, Vesselin Dimitrov and Yunqing Tang proved the irrationality of an infinite collection of numbers related to the Riemann zeta function, building on Roger Apery's landmark 1978 proof about a single such number.

The new approach, which relies on 19th-century mathematical techniques, has already helped settle a 50-year-old conjecture about modular forms and could lead to more advances in number theory.

Christie Wilcox reports via Science.org: Both longhorn crazy ants (Paratrechina longicornis) and humans can figure out how to work together to move an unwieldy object through a series of obstacles. So scientists pitted the two against each other. They had individuals and groups of different sizes of both species maneuver a T-shaped object through holes in walls (as seen in the video above), both of which were scaled to the body size of the participants. This kind of puzzle is hard for ants because their pheromone-based communication doesn't account for the kind of geometry needed to get the object through the doors. To make the experiments even more comparable, the team also took away the humans' communication in some of the trials by making them wear sunglasses and masks and forbidding talking and gestures. So the people, like the ants, had to work together without language, relying on the forces generated by their fellow participants to figure out how to move the T-shaped piece.

The groups of ants were much better at solving the puzzle than individual ants, exhibiting what the researchers described as "emergent" collective memory -- an intelligence greater than the sum of its parts. The groups of humans, on the other hand, often didn't do better when working together, especially if they weren't allowed to talk. In fact, multiple people sometimes performed worse than individuals -- and worse than the ants. The researchers posit that, in the absence of the ability to discuss and debate, individuals attempt to reach a consensus quickly rather than fully assessing the problem. This "groupthink," they suggest, leads people toward fruitless "greedy" efforts where they directly pull the T toward the gaps in the wall, rather than the less obvious, correct solution of pulling the object into the space between first. Whereas the ants "excel in cooperation," they write, humans need to be able to talk through their reasoning to avoid simply going with what they think the crowd wants. The study has been published in the journal Proceedings of the National Academy of Sciences.

NASA's Jet Propulsion Laboratory (JPL), located at the base of the San Gabriel Mountains just north of Los Angeles, has been temporarily shuttered due to the nearby Eaton fire. "JPL is closed except for emergency personnel. No fire damage so far (some wind damage) but it is very close to the lab. Hundreds of JPLers have been evacuated from their homes & many have lost homes. Special thx to our emergency crews. Pls keep us in your thoughts & stay safe," JPL Director Laurie Leshin announced via X today (Jan. 8). Space.com reports: JPL is federally funded but managed by the California Institute of Technology in Pasadena. The center runs many of NASA's high-profile robotic missions, such as the Perseverance and Curiosity Mars rovers and the $5 billion Europa Clipper, which recently launched to explore an intriguing ocean moon of Jupiter.

The Eaton fire sparked up on Tuesday evening (Jan. 7) near Altadena, which is just north of Pasadena. It has burned at least 1,000 acres (400 hectares) to date, according to CBS News, which cited the California Department of Forestry and Fire Protection (CalFire). The Eaton fire is one of several big blazes churning through the Los Angeles area, driven and spread by record-setting winds. The biggest and most destructive is the Palisades Fire, which is laying waste to the Pacific Palisades neighborhood on the west side of the city.

The Register's Connor Jones reports: Marc Rogers, DEF CON's head of security, faces tens of thousands of dollars in medical bills following an accident that left him with a broken neck and temporary quadriplegia. The prominent industry figure, whose work has spanned roles at tech companies such as Vodafone and Okta, including ensuring the story lines on Mr Robot and The Real Hustle were factually sound, is recovering in hospital. [...] Rogers said it will be around four to six weeks before he returns to basic independence and is able to travel, but a full recovery will take up to six months. He begins a course of physical therapy today, but his insurance will only cover the first of three required weeks, prompting friends to set up a fundraiser to cover the difference.

Rogers has an impressive cyber CV. Beginning life in cybersecurity back in the '80s when he went by the handle Cjunky, he has gone on to assume various high profile roles in the industry. In addition to the decade leading Vodafone UK's cybersecurity and being the VP of cybersecurity strategy at Okta, as already mentioned, Rogers has also worked as head of security at Cloudflare and founded Vectra, among other experiences. Now he heads up security at DEF CON, is a member of the Ransomware Taskforce, and is the co-founder and CTO at AI observability startup nbhd.ai.

If you hadn't heard of him from any of these roles, or from his work in the entertainment biz, he's also known for his famous research into Apple's Touch ID sensor, which he was able to compromise on both the iPhone 5S and 6 during his time as principal researcher at Lookout. Other consumer-grade kit to get the Rogers treatment include the short-lived Google Glass devices, also while he was at Lookout, and the Tesla Model S back in 2015. "It's a sad fact that in the US GoFundMe has become the de facto standard for covering insurance shortfalls," Rogers said. "I will be forever grateful to my friends who stood it up for me and those who donated to it so that I can resume making bad guys cry as soon as feasibly possible."

The cybersecurity community has rallied together to support Rogers' fundraiser, which has accrued over $83,000 in donations. The goal is $100,000.

An anonymous reader quotes a report from The Guardian: People who get their coffee hit in the morning reap benefits that are not seen in those who have shots later in the day, according to the first major study into the health benefits of the drink at different times. Analysis of the coffee consumption of more than 40,000 adults found that morning coffee drinkers were 16% less likely to die of any cause and 31% less likely to die from cardiovascular disease during a 10-year follow-up period than those who went without. But the benefits to heart health appeared to vanish in people who drank coffee throughout the day, the researchers found, with medical records showing no significant reduction in mortality for all-day drinkers compared with those who avoided coffee. [...]

The study suggests that a morning dose of coffee is better for the heart than an evening one, but it does not explain why. One possible explanation is that drinking coffee later in the day can disrupt circadian rhythms and levels of hormones such as melatonin. This in turn affects sleep, inflammation and blood pressure, all of which can harm heart health. In an accompanying editorial, Prof Thomas Luscher, a consultant cardiologist at the Royal Brompton and Harefield hospitals in London, notes that many all-day drinkers sleep poorly, adding that coffee seems to suppress melatonin, a hormone that is important for inducing sleep in the brain. The effects are driven largely by caffeine, but coffee contains hundreds of other bioactive compounds that affect our physiology. The researchers say some substances in the blood that drive inflammation often peak in the morning and could be countered by anti-inflammatory compounds in a morning coffee. "This explanation applies to both caffeinated and decaffeinated coffee," they write. "Overall, we must accept the now substantial evidence that coffee drinking, particularly in the morning hours, is likely to be healthy," Luscher writes. "Thus, drink your coffee, but do so in the morning!"

The study has been published in the European Heart Journal.

Scientists have discovered that quarks and gluons inside protons are quantum entangled, challenging traditional views of proton structure and revealing a more complex, dynamic system influenced by strong interactions. Space.com reports: Entanglement is the aspect of quantum physics that says two affected particles can instantaneously influence each other's "state" no matter how widely separated they are -- even if they are on opposite sides of the universe. Albert Einstein founded his theories of relativity on the notion that nothing can travel faster than the speed of light, however, something that should preclude the instantaneous nature of entanglement.

As a result, Einstein was so troubled by entanglement he famously described it as "spukhafte Fernwirkung" or "spooky action at a distance." Yet, despite Einstein's skepticism about entanglement, this "spooky" phenomenon has been verified over and over again. Many of those verifications have concerned testing increasing distances over which entanglement can be demonstrated. This new test took the opposite approach, investigating entanglement over a distance of just one quadrillionth of a meter, finding it actually occurs within individual protons.

The team found that the sharing of information that defines entanglement occurs across whole groups of fundamental particles called quarks and gluons within a proton. "Before we did this work, no one had looked at entanglement inside of a proton in experimental high-energy collision data," team member and Brookhaven Lab physicist Zhoudunming Tu said in a statement. "For decades, we've had a traditional view of the proton as a collection of quarks and gluons, and we've been focused on understanding so-called single-particle properties, including how quarks and gluons are distributed inside the proton. "Now, with evidence that quarks and gluons are entangled, this picture has changed. We have a much more complicated, dynamic system." The team's research, the culmination of six years of work, refines scientists' understanding of how entanglement influences the structure of protons. The team's research was published in the journal Reports on Progress in Physics.

The shift from paywalled to open-access scientific publishing is progressing, driven in part by platforms like Sci-Hub -- a website that allows users to upload PDFs of published papers and share them with anyone. While the shadow library website has faced ongoing attempts by publishers to block access, it has another problem: the platform features many outdated or retracted papers that could spread misinformation or flawed findings. Ars Technica reports: Sci-Hub works a bit like a combination of cache and aggregator for published materials. Whenever it gets a request for a paper that's not already in its database, it uses leaked login credentials to go to the website of whatever journal published the paper and obtain a copy. If it already has a copy, however, it will simply serve that up instead. This leaves open the possibility that it will have obtained a copy of a paper prior to its retraction and continue to distribute that copy after the paper has been retracted.

To check this, the researchers obtained a list of nearly 17,000 retracted papers and searched for them on Sci-Hub. They then visually examined the documents that were returned. They found that 85 percent of them contained no indication that the paper had been retracted. "The availability of [unlabeled retracted articles] in the field of health sciences is particularly high," they note, "which indicates a significant risk of their unintended use and further citation in future research."

While corrections are less severe than retractions, they're likely to suffer a similar problem. And corrections will often involve the technical details of a paper -- the experimental approaches or raw data that will be critical for anyone wanting to replicate or extend previously published results. So, if anything, their impact will be more significant. Ars notes that a system called Crossmark is available to help find the most up-to-date version of a paper, including any corrections or retraction notices.

Before NASA Administrator Bill Nelson retires in a couple of weeks, he has one final message for the next administration: Don't give up on the agency's Artemis Program to return humans to the Moon. In an interview with Ars Technica's Eric Berger, Nelson discussed his time in office, the major decisions he made, and his concerns for the space agency's future under the Trump administration. Here's an excerpt from the interview: Ars: I wanted to start with the state of Artemis. You all had an event a few weeks ago where you talked about Artemis II and Artemis III delays. And you know, both those missions have slipped a couple of years now since you've been administrator. So I'm just wondering, do you know how confident we should be in the current timeline?

Bill Nelson: Well, I am very confident because this most recent [delay] was occasioned by virtue of the heat shield, and it has been unanimous after all of the testing that they understand what happened to Orion's heat shield. The chunks came off in an irregular pattern from the Artemis I heat shield. With the change in the re-entry profile, they are unanimous in their recommendation that we can go with the Artemis II heat shield as it is. And I must say that of the major decisions that I've made, that was an easy one for me because it was unanimous. When I say it was unanimous, it was unanimous in the IRT, the independent review team, headed by Paul Hill. It wasn't to begin with, but after all the extensive testing, everybody was on board. It was unanimous in the deputy's committee. It was unanimous in the agency committee, and that brought it to me then in the Executive Council, and it was unanimous there. So I'm very confident that you're going to see Artemis II fly on or around April of 2026, and then if the SpaceX lander is ready, and that, of course, is a big if -- but they have met all of their milestones, and we'll see what happens on this next test... If they are ready, I think it is very probable that we will see the lunar landing in the summer of 2027.

Ars: Do you think it's appropriate for the next administration to review the Artemis Program?

Bill Nelson: Are you implying that Artemis should be canceled?

Ars: No. I don't think Artemis will be canceled in the main. But I do think they're going to take a look at the way the missions are done at the architecture. I know NASA just went through that process with Orion's heat shield.

Bill Nelson: Well, I think questioning what you're doing clearly is always an issue that ought to be on the table. But do I think that they are going to cancel, as some of the chatter out there suggests, and replace SLS with Starship? The answer is no.

Ars: Why?

Bill Nelson: Put yourself in the place of President Trump. Do you think President Trump would like to have a conversation with American astronauts on the surface of the Moon during his tenure?

Ars: Of course.

Bill Nelson: OK, let me ask you another question. Do you think that President Trump would rather have a conversation with American astronauts during his tenure rather than listening to the comments of Chinese astronauts on the Moon during his tenure? My case is closed, your Honor, I submit it to the jury. Further reading: Elon Musk: 'We're Going Straight to Mars. The Moon is a Distraction.'

Computer scientists are using hypothetical devices called "oracles" to advance the field of computational complexity theory, exploring fundamental questions about problem-solving difficulty. These theoretical tools, which instantly provide correct yes-or-no answers to specific questions, help researchers understand relationships between different classes of computational problems.

Oracles have proved particularly valuable in studying quantum computing, leading to breakthroughs like Peter Shor's 1994 quantum algorithm for factoring large numbers. The technique has also helped researchers rule out certain approaches to solving the longstanding P versus NP problem, a central question in computer science.

"We're going straight to Mars. The Moon is a distraction," Elon Musk posted Thursday on X.com.

Ars Technica's senior space editor points out that "These are definitive statements that directly contradict NASA's plans to send a series of human missions to the lunar south pole later this decade and establish a sustainable base of operations there with the Artemis Program." And "It would be one thing if Musk was just expressing his opinion as a private citizen..." but Musk "has assumed an important advisory role for the incoming administration. He was also partly responsible for the expected nomination of private astronaut [and former SpaceX flight commander] Jared Isaacman to become the next administrator of NASA. Although Musk is not directing US space policy, he certainly has a meaningful say in what happens." So what does this mean for Artemis? The fate of Artemis is an important question not just for NASA but for the US commercial space industry, the European Space Agency, and other international partners who have aligned with the return of humans to the Moon. With Artemis, the United States is in competition with China to establish a meaningful presence on the surface of the Moon. Based upon conversations with people involved in developing space policy for the Trump administration, I can make some educated guesses about how to interpret Musk's comments. None of these people, for example, would disagree with Musk's assertion that "the Artemis architecture is extremely inefficient" and that some changes are warranted.

With that said, the Artemis Program is probably not going away. After all, it was the first Trump administration that created the program about five years ago. However, it may be less well-remembered that the first Trump White House pushed for more significant changes, including a "major course correction" at NASA... To a large extent, NASA resisted this change during the remainder of the Trump administration, keeping its core group of major contractors, such as Boeing and Lockheed Martin, in place. It had help from key US Senators, including Richard Shelby, the now-retired Republican from Alabama. But this time, the push for change is likely to be more concerted, especially with key elements of NASA's architecture, including the Space Launch System rocket, being bypassed by privately developed rockets such as SpaceX's Starship vehicle and Blue Origin's New Glenn rocket.

In all likelihood, NASA will adopt a new "Artemis" plan that involves initiatives to both the Moon and Mars. When Musk said "we're going straight to Mars," he may have meant that this will be the thrust of SpaceX, with support from NASA. That does not preclude a separate initiative, possibly led by Blue Origin with help from NASA, to develop lunar return plans.
One month ago in a post on X.com, incoming NASA administrator Isaacman described himself as "passionate about America leading the most incredible adventure in human history..."

And he also added that Americans "will walk on the Moon and Mars and in doing so, we will make life better here on Earth."

"Private space stations have been raising billions of dollars in an effort to build future hubs — and even one day cities — in orbit," according to a recent report from the U.K. newspaper, the Telegraph: Axiom Space, a US business aiming to build its own station, has raised more than $500m (£400m). Vast, a space business backed by crypto billionaire Jed McCaleb, is plotting two stations before the end of the decade. Gravitics, meanwhile, has raised tens of millions of dollars for its modular space "real estate". Nasa itself, along with other space agencies, is planning a further station, Lunar Gateway, which will orbit the Moon. Jeff Bezos's Blue Origin has also announced plans to build a space station by 2027, called Orbital Reef, which it has described as an orbital "mixed-use business park". Working with US aerospace business Sierra Space, Orbital Reef will be made up of inflatable pods, which can be launched on a regular rocket before being "blown up" in space. Sierra Space says these modules could house in-space manufacturing or pharmaceutical technology...

Since 2021, Nasa has also offered to pay hundreds of millions of dollars to private companies to develop commercial space stations that could succeed the ISS. So far, it has handed $400m to companies including Axiom, Blue Origin (which is working with Sierra Space), and Northrop Grumman... Vast hopes to launch its first space station, Haven-1, as soon as 2025. This simple module will be the first privately-run space station and will be occupied by a crew of four over four two week expeditions... While Vast was not one of the businesses to secure funding from Nasa, it hopes by launching the first proof-of-concept space station as soon as next year it can leapfrog rival efforts and claim the agency as an anchor customer. From there, it can target other space agencies or companies looking to conduct research.
Some interesting perspectives from the article:

• Chris Quilty, an analyst at Quilty Space: "If China were not building its own space station it is arguable whether Nasa would have felt enjoined to maintain a human presence in low Earth orbit."

• Tim Farrar, founder of TMF Associates, which advises some of the world's top space companies: "Unless they either secure government funding or focus on space tourism, they will inevitably have to rely on the largess of either billionaires or gullible investors who are space enthusiasts."

Thanks to Slashdot reader fjo3 for sharing the news.

Cornell Tech researchers have developed a portable device called SoilScanner that uses radio frequency signals and machine learning to detect lead contamination in soil. It offers a cost-effective alternative to traditional methods of testing that "generally involves either sending samples to a lab for analysis, which relies upon harsh chemicals and can be expensive, or using a portable X-ray fluorescence device," notes Phys.org. From the report: "In recent years, especially during COVID, a lot of us got excited about having our own backyard garden, or spending more time at home," said [Rajalakshmi Nandakumar, assistant professor at the Jacobs Technion-Cornell Institute at Cornell Tech] who's also a member of the Department of Information Science in the Cornell Ann S. Bowers College of Computing and Information Science. "But if you look at instructions for how to grow tomatoes, no one actually tells you that you have to check your soil for lead," she said. "It's all about pH levels. A lot of us, even though we interact very often with soils, are totally unaware of possible lead contamination."

[Yixuan Gao, a doctoral candidate in computer science] said the group was motivated by a map of lead contamination in New York City that Cheng's Urban Soils Lab (USL) had produced over the course of several years of testing for hundreds of soil samples throughout the five boroughs. The testing revealed dangerously high levels of lead in many locations, most notably in northern Brooklyn. About 45% of the soil samples tested by USL had lead levels above 400 parts per million (ppm), the previous EPA recommended screening level (revised a year ago to 200 ppm for residential soils). "This means there is a significant risk when gardening in these urban soils," Gao said. You can learn more about the device here (PDF).

ZipNada shares a report from Phys.org: In a paper published today in Nature, a team led by Columbia Engineering researchers and collaborators report that they have invented new nanoscale sensors of force. They are luminescent nanocrystals that can change intensity and/or color when you push or pull on them. These "all-optical" nanosensors are probed with light only and therefore allow for fully remote read-outs -- no wires or connections are needed. They have 100 times better force sensitivity than the existing nanoparticles that utilize rare-earth ions for their optical response, and an operational range that spans more than four orders of magnitude in force, a much larger range -- 10-100 times larger -- than any previous optical nanosensor. "We expect our discovery will revolutionize the sensitivities and dynamic range achievable with optical force sensors, and will immediately disrupt technologies in areas from robotics to cellular biophysics and medicine to space travel," said Jim Schuck, associate professor of mechanical engineering.

"The importance of developing new force sensors was recently underscored by Ardem Patapoutian, the 2021 Nobel Laureate who emphasized the difficulty in probing environmentally sensitive processes within multiscale systems -- that is to say, in most physical and biological processes," Schuck notes. "We are excited to be part of these discoveries that transform the paradigm of sensing, allowing one to sensitively and dynamically map critical changes in forces and pressures in real-world environments that are currently unreachable with today's technologies."

Scientists have discovered that great whales can live well beyond previously estimated lifespans, according to research published in Science Advances. The study found that southern right whales can survive past 130 years, while their heavily hunted northern counterparts rarely live beyond 47 years.

The findings support earlier evidence from Arctic bowhead whales, which can reach 200 years old. Scientists determined whale ages by analyzing earplugs from specimens caught by Japanese whalers in the 1970s, revealing some fin and blue whales lived to at least 114 years.

Studies using new brain-mapping and wearable devices have shown that unstimulating urban architecture can harm residents' health, leading to increased rates of depression, cancer and diabetes. Research projects across Europe and North America, including the EU-funded eMOTIONAL Cities project and studies at the University of Waterloo's Urban Realities Laboratory, are measuring people's physiological responses to their surroundings. The findings are pushing architects and city planners to prioritize human wellbeing in design, with some cities like London's Newham borough now including happiness metrics in economic planning.

Exercise is the most potent medical intervention known, according to Stanford University researchers who mapped its molecular effects across body tissues. In a study examining sedentary and exercising rats over eight weeks, scientists found comprehensive changes in every tissue examined, from fat cells to mitochondria, with exercise often reversing disease-related molecular changes. The findings explain how exercise reduces heart disease and cancer risks by 50%.

MIT scientists have pinpointed the origin of a fast radio burst (FRB) to within 10,000 kilometers of a neutron star, settling a long-standing debate about these cosmic phenomena. Using a novel technique analyzing signal scintillation, researchers determined that FRB 20221022A, detected in 2022 from a galaxy 200 million light-years away, emerged from the star's turbulent magnetosphere rather than from a distant shockwave.

The findings, published in Nature, provide the first conclusive evidence that FRBs can originate in the extreme magnetic environment immediately surrounding these ultra-compact objects.

Research from Zhejiang Agriculture and Forestry University reveals a concerning correlation between micro and nanoplastic (MNP) concentrations in damaged human tissues and various health conditions, including inflammatory bowel disease, thrombosis, and cancer. Phys.Org reports: In the study, "Mapping micro(nano)plastics in various organ systems: Their emerging links to human diseases?" published in TrAC Trends in Analytical Chemistry, investigators collected 61 available research articles for MNP detection in human tissues, plus 840 articles on MNP toxicological mechanisms. Data came from spectroscopy, microscopy, and pyrolysis-gas chromatography/mass spectrometry investigations to identify polymer types in different tissues. Toxicological studies employed cell models and animal experiments to examine oxidative stress, inflammatory responses, and related signaling pathways.

The studies documented particles detected in skin, arteries, veins, thrombi, bone marrow, testes, semen, uterus, and placenta. MNPs were found in the digestive system, from saliva to feces, liver, and gallstones. Within the respiratory system, MNPs were everywhere, including lung tissue, with microscopic fibers common in bronchoalveolar lavage fluid and sputum. Positive correlations emerged between particle abundance and specific disorders, such as inflammatory bowel disease, thrombosis, cervical cancer, and uterine fibroids. Toxicological tests showed possible MNP-triggered oxidative stress, mitochondrial dysfunction, inflammatory responses, and apoptosis in various cell types, along with organ-level concerns like neurodegenerative disease onset when crossing the blood-brain barrier.

A critically important signal in the metadata discovered by the researchers was that measured levels of MNPs tended to be higher in tissues with lesions than in non-lesioned tissues. These included inflamed intestines, fibrotic lungs, or cancerous growths, suggesting a potential link between MNP buildup and local pathology. There is an intriguing "what came first, the chicken or the egg" problem with lesions having higher concentrations of MNPs. [...] In the case of "what came first, the lesion or the microplastic," it is possible that MNPs contribute to inflammation, oxidative stress, and cellular damage, which can cause or worsen tissue lesions. But it is also possible that these lesions accumulate more MNPs in already damaged tissue areas. While the current findings do not provide a direct cause-and-effect relationship, they offer good targets for further study.

An anonymous reader quotes a report from The Guardian: When the scientist and inventor Prof Archibald Montgomery Low predicted "a day in the life of a man of the future" one century ago, his prophecies were sometimes dismissed as "ruthlessly imaginative." They included, reported the London Daily News in 1925, "such horrors" as being woken by radio alarm clock; communications "by personal radio set"; breakfasting "with loudspeaker news and television glimpses of events"; shopping by moving stairways and moving pavements. One hundred years after Low's publication of his book The Future some of his forecasts were spot on. Others, including his prophecy that everyone would be wearing synthetic felt one-piece suits and hats, less so.

Researchers from the online genealogy service Findmypast, have excavated accounts of Low's predictions from its extensive digital archive of historical newspapers available to the public and included them in a collection on its website of forecasts made for 2025 by people a century ago. Low, born in 1888, was an engineer, research physicist, inventor and author. A pioneer in many fields, he invented the first powered drone, worked on the development of television, was known as the "father of radio guidance systems" for his work on planes, torpedo boats and guided rockets and reportedly attracted at least two unsuccessful assassination attempts by the Germans. "It's amazing that a century ago, one visionary scientist could predict how emerging technology -- in its infancy at the time -- could have changed the world by 2025," said Jen Baldwin, a research specialist at Findmypast. "It makes you stop to wonder how the advancements we see around us today will be experienced by our own descendants."

Astronomers using the James Webb Space Telescope have discovered Zhulong, the most distant grand-design spiral galaxy identified so far, located at a redshift of approximately 5.2. Phys.Org reports: The galaxy was named Zhulong, after a giant red solar dragon and god in Chinese mythology. [...] Its mass was found to be comparable to that of the Milky Way, which is relatively high for a galaxy that formed within one billion years after the Big Bang, as the redshift indicates. The study found that Zhulong has a classical bulge and a large face-on stellar disk with spiral arms extending across 62,000 light years. The spectral energy distribution (SED) analysis points to a quiescent-like core and a star-forming stellar disk. Furthermore, it turned out that compared to the stellar disk, the center core of Zhulong is red and has the highest stellar mass surface densities measured among quiescent galaxies. The core is quiescent, which is consistent with the expectations of inside-out galaxy growth and quenching.

The study also found that although the disk is still forming stars, Zhulong has a relatively low overall star-formation rate -- at a level of 66 solar masses per year. The baryons-to-stars conversion efficiency was calculated to be approximately 0.3, which is about 1.5 times higher than even the most efficient galaxies at later epochs. These results suggest that Zhulong must have been forming stars very efficiently and is in the transformation phase from star-forming to quiescence. In concluding remarks, the authors of the paper note that Zhulong appears to be the most distant spiral galaxy discovered to date. The properties of this galaxy seem to suggest that mature galaxies emerged much earlier than expected in the first billion years after the Big Bang. The findings have been published on the pre-print server arXiv.