Researchers at the University of Waterloo say a new "quadratic quantum gravity" framework could explain the universe's rapid early expansion without adding extra ingredients to Einstein's theory by hand. The idea is especially notable because it makes testable predictions, including a minimum level of primordial gravitational waves that future experiments may be able to detect. "Even though this model deals with incredibly high energies, it leads to clear predictions that today's experiments can actually look for," said Dr. Niayesh Afshordi, professor of physics and astronomy at the University of Waterloo and Perimeter Institute (PI). "That direct link between quantum gravity and real data is rare and exciting." Phys.org reports: The research team found that the Big Bang's rapid early expansion can emerge naturally from this simple, consistent theory of quantum gravity, without adding any extra ingredients. This early burst of expansion, often called inflation, is a central idea in modern cosmology because it explains why the universe looks the way it does today.

Their model also predicts a minimum amount of primordial gravitational waves, which are tiny ripples in spacetime geometry created in the first moments after the Big Bang. These signals may be detectable in upcoming experiments, offering a rare chance to test ideas about the universe's quantum origins.

[...] The team plans to refine their predictions for upcoming experiments to explore how their framework connects to particle physics and other puzzles about the early universe. Their long-term goal is to strengthen the bridge between quantum gravity and observational cosmology. The research has been published in the journal Physical Review Letters.

alternative_right shares a report from Phys.org: Astronomers have an answer for a long-running mystery in astrophysics: why is the growth of supermassive black holes so much lower today than in the past? A study using NASA's Chandra X-ray Observatory and other X-ray telescopes found that supermassive black holes are unable to consume material as rapidly as they did in the distant past. The results appeared in the December 2025 issue of The Astrophysical Journal.

[...] The team ran tests of the three main possible scenarios currently being considered for the slowdown of black hole growth. These options were: could the decline in black hole growth be caused by less efficient rates of consumption, or by smaller typical black hole masses, or by fewer actively growing black holes? Their analysis of the data, extending over billions of years of cosmic history, led them to the conclusion that black holes are indeed consuming material less rapidly the later they are found after the Big Bang. The researchers expect this trend of slower-growing black holes to continue into the future.

2001: "Brookhaven Labs has produced for the first time collisions of gold nuclei at a center of mass energy of 200GeV/nucleon."

2002: "There may be a new type of matter according to researchers at Brookhaven National Laboratory."

2010: The hottest man-made temperatures ever achived were a record 4 trillion degree plasma experiment at Brookhaven National Laboratory in New York... anointed the Guinness record holder."

2023: "Scientists at Brookhaven National Laboratory have uncovered an entirely new kind of quantum entanglement."


2026: On Friday, February 6, "a control room full of scientists, administrators and members of the press gathered" at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Lab in Upton, New York to witness its final collisions, reports Scientific American: The vibe had been wistful, but the crowd broke into applause as Darío Gil, the Under Secretary for Science at the U.S. Department of Energy, pressed a red button to end the collider's quarter-century saga... "I'm really sad" [said Angelika Drees, a BNL accelerator physicist]. "It was such a beautiful experiment and my research home for 27 years. But we're going to put something even better there."

That "something" will be a far more powerful electron-ion collider to further push the frontiers of physics, extend RHIC's legacy and maintain the lab's position as a center of discovery. This successor will be built in part from RHIC's bones, especially from one of its two giant, subterranean storage rings that once held the retiring collider's supply of circulating, near-light speed nuclei...slated for construction over the next decade. [That Electron-Ion Collider, or EIC] will utilize much of RHIC's infrastructure, replacing one of its ion rings with a new ring for cycling electrons. The EIC will use those tiny, fast-flying electrons as tiny knives for slicing open the much larger gold ions. Physicists will get an unrivaled look into the workings of quarks and gluons and yet another chance to grapple with nature's strongest force. "We knew for the EIC to happen, RHIC needed to end," says Wolfram Fischer, who chairs BNL's collider-accelerator department. "It's bittersweet."

EIC will be the first new collider built in the US since RHIC. To some, it signifies the country's reentry into a particle physics landscape it has largely ceded to Europe and Asia over the past two decades. "For at least 10 or 15 years," says Abhay Deshpande, BNL's associate laboratory director for nuclear and particle physics, "this will be the number one place in the world for [young physicists] to come."
The RHIC was able "to separately send two protons colliding with precisely aligned spins — something that, even today, no other experiment has yet matched," the article points out: During its record-breaking 25-year run, RHIC illuminated nature's thorniest force and its most fundamental constituents. It created the heaviest, most elaborate assemblages of antimatter ever seen. It nearly put to rest a decades-long crisis over the proton's spin. And, of course, it brought physicists closer to the big bang than ever before...

When RHIC at last began full operations in 2000, its initial heavy-ion collisions almost immediately pumped out quark-gluon plasma. But demonstrating this beyond a shadow of a doubt proved in some respects more challenging than actually creating the elusive plasma itself, with the case for success strengthening as RHIC's numbers of collisions soared. By 2010 RHIC's scientists were confident enough to declare that the hot soup they'd been studying for a decade was hot and soupy enough to convincingly constitute a quark-gluon plasma. And it was even weirder than they thought. Instead of the gas of quarks and gluons theorists expected, the plasma acted like a swirling liquid unprecedented in nature. It was nearly "perfect," with zero friction, and set a new record for twistiness, or "vorticity." For Paul Mantica, a division director for the Facilities and Project Management Division in the DOE's Office of Nuclear Physics, this was the highlight of RHIC's storied existence. "It was paradigm-changing," he says...

Data from the final run (which began nearly a year ago) has already produced yet another discovery: the first-ever direct evidence of "virtual particles" in RHIC's subatomic puffs of quark-gluon plasma, constituting an unprecedented probe of the quantum vacuum.
RHIC's last run generated hundreds of petabytes of data, the article points out, meaning its final smash "isn't really the end; even when its collisions stop, its science will live on."

But Science News notes RHIC's closure "marks the end for the only particle collider operating in the United States, and the only collider of its kind in the world. Most particle accelerators are unable to steer two particle beams to crash head-on into one another."

An anonymous reader shared this report from CNN: The universe's expansion might not be accelerating but slowing down, a new study suggests. If confirmed, the finding would upend decades of established astronomical assumptions and rewrite our understanding of dark energy, the elusive force that counters the inward pull of gravity in our universe...

Last year, a consortium of hundreds of researchers using data from the Dark Energy Spectroscopic Instrument (DESI) in Arizona, developed the largest ever 3D map of the universe. The observations hinted at the fact that dark energy may be weakening over time, indicating that the universe's rate of expansion could eventually slow. Now, a study published November 6 in the journal Monthly Notices of the Royal Astronomical Society provides further evidence that dark energy might not be pushing on the universe with the same strength it used to. The DESI project's findings last year represented "a major, major paradigm change ... and our result, in some sense, agrees well with that," said Young-Wook Lee, a professor of astrophysics at Yonsei University in South Korea and lead researcher for the new study....

To reach their conclusions, the researchers analyzed a sample of 300 galaxies containing Type 1a supernovas and posited that the dimming of distant exploding stars was not only due to their moving farther away from Earth, but also due to the progenitor star's age... [Study coauthor Junhyuk Son, a doctoral candidate of astronomy at Yonsei University, said] "we found that their luminosity actually depends on the age of the stars that produce them — younger progenitors yield slightly dimmer supernovae, while older ones are brighter." Son said the team has a high statistical confidence — 99.99% — about this age-brightness relation, allowing them to use Type 1a supernovas more accurately than before to assess the universe's expansion... Eventually, if the expansion continues to slow down, the universe could begin to contract, ending in what astronomers imagine may be the opposite of the big bang — the big crunch. "That is certainly a possibility," Lee said. "Even two years ago, the Big Crunch was out of the question. But we need more work to see whether it could actually happen."

The new research proposes a radical revision of accepted knowledge, so, understandably, it is being met with skepticism. "This study rests on a flawed premise," Adam Riess, a professor of physics and astronomy at the Johns Hopkins University and one of the recipients of the 2011 Nobel Prize in physics, said in an email. "It suggests supernovae have aged with the Universe, yet observations show the opposite — today's supernovae occur where young stars form. The same idea was proposed years ago and refuted then, and there appears to be nothing new in this version." Lee, however, said Riess' claim is incorrect. "Even in the present-day Universe, Type Ia supernovae are found just as frequently in old, quiescent elliptical galaxies as in young, star-forming ones — which clearly shows that this comment is mistaken. The so-called paper that 'refuted' our earlier result relied on deeply flawed data with enormous uncertainties," he said, adding that the age-brightness correlation has been independently confirmed by two separate teams in the United States and China... "Extraordinary claims require extraordinary evidence," Dragan Huterer, a professor of physics at the University of Michigan in Ann Arbor, said in an email, noting that he does not feel the new research "rises to the threshold to overturn the currently favored model...."

The new Vera C. Rubin Observatory, which started operating this year, is set to help settle the debate with the early 2026 launch of the Legacy Survey of Space and Time, an ultrawide and ultra-high-definition time-lapse record of the universe made by scanning the entire sky every few nights over 10 years to capture a compilation of asteroids and comets, exploding stars, and distant galaxies as they change.

fahrbot-bot shares a report from Phys.org: Physicists from Swansea University have played the leading role in a scientific breakthrough at CERN, developing an innovative technique that increases the antihydrogen trapping rate by a factor of ten. The advancement, achieved as part of the international Antihydrogen Laser Physics Apparatus (ALPHA) collaboration, has been published in Nature Communications and could help answer one of the biggest questions in physics: Why is there such a large imbalance between matter and antimatter? According to the Big Bang theory, equal amounts were created at the beginning of the universe, so why is the world around us made almost entirely of matter?

Antihydrogen is the "mirror version" of hydrogen, made from an antiproton and a positron. Trapping and studying it helps scientists explore how antimatter behaves, and whether it follows the same rules as matter. Producing and trapping antihydrogen is an extremely complicated process. Previous methods took 24 hours to trap just 2,000 atoms, limiting the scope of experiments at ALPHA. The Swansea-led team has changed that. Using laser-cooled beryllium ions, the team has demonstrated that it is possible to cool positrons to less than 10 Kelvin (below -263C), significantly colder than the previous threshold of about 15 Kelvin. These cooler positrons dramatically boost the efficiency of antihydrogen production and trapping -- allowing a record 15,000 atoms to be trapped in less than seven hours.

An anonymous reader shares a report: Microsoft, eager to boost downloads of its Copilot chatbot, has recruited some of the most popular influencers in America to push a message to young consumers that might be summed up as: Our AI assistant is as cool as ChatGPT. Microsoft could use the help. The company recently said its family of Copilot assistants attracts 150 million active users each month. But OpenAI's ChatGPT claims 800 million weekly active users, and Google's Gemini boasts 650 million a month. Microsoft has an edge with corporate customers, thanks to a long history of selling them software and cloud services. But it has struggled to crack the consumer market -- especially people under 30.

"We're a challenger brand in this area, and we're kind of up and coming," Consumer Chief Marketing Officer Yusuf Mehdi said in an interview. Mehdi hopes to persuade key influencers to make Copilot their chatbot of choice and then use their popularity to market the assistant to their millions of followers. He says Microsoft is already getting more bang for the buck with influencers than with traditional media, but didn't provide any metrics.

[...] Using non-techies as spokespeople is meant to reinforce Microsoft's campaign to sell its chatbot as a life coach for everyone. Or as Consumer AI chief Mustafa Suleyman wrote in a recent essay, an AI companion that "helps you think, plan and dream."

"These are the last days of social media as we know it," argues a humanities lecturer from University College Cork exploring where technology and culture intersect, warning they could become lingering derelicts "haunted by bots and the echo of once-human chatter..."

"Whatever remains of genuine, human content is increasingly sidelined by algorithmic prioritization, receiving fewer interactions than the engineered content and AI slop optimized solely for clicks... " In recent years, Facebook and other platforms that facilitate billions of daily interactions have slowly morphed into the internet's largest repositories of AI-generated spam. Research has found what users plainly see: tens of thousands of machine-written posts now flood public groups — pushing scams, chasing clicks — with clickbait headlines, half-coherent listicles and hazy lifestyle images stitched together in AI tools like Midjourney... While content proliferates, engagement is evaporating. Average interaction rates across major platforms are declining fast: Facebook and X posts now scrape an average 0.15% engagement, while Instagram has dropped 24% year-on-year. Even TikTok has begun to plateau. People aren't connecting or conversing on social media like they used to; they're just wading through slop, that is, low-effort, low-quality content produced at scale, often with AI, for engagement.

And much of it is slop: Less than half of American adults now rate the information they see on social media as "mostly reliable" — down from roughly two-thirds in the mid-2010s... Platforms have little incentive to stem the tide. Synthetic accounts are cheap, tireless and lucrative because they never demand wages or unionize. Systems designed to surface peer-to-peer engagement are now systematically filtering out such activity, because what counts as engagement has changed. Engagement is now about raw user attention — time spent, impressions, scroll velocity — and the net effect is an online world in which you are constantly being addressed but never truly spoken to.
"These are the last days of social media, not because we lack content," the article suggests, "but because the attention economy has neared its outer limit — we have exhausted the capacity to care..." Social media giants have stopped growing exponentially, while a significant proportion of 18- to 34-year-olds even took deliberate mental health breaks from social media in 2024, according to an American Psychiatric Association poll.) And "Some creators are quitting, too. Competing with synthetic performers who never sleep, they find the visibility race not merely tiring but absurd."

Yet his 5,000-word essay predicts social media's death rattle "will not be a bang but a shrug," since "the model is splintering, and users are drifting toward smaller, slower, more private spaces, like group chats, Discord servers and federated microblogs — a billion little gardens." Intentional, opt-in micro-communities are rising in their place — like Patreon collectives and Substack newsletters — where creators chase depth over scale, retention over virality. A writer with 10,000 devoted subscribers can potentially earn more and burn out less than one with a million passive followers on Instagram... Even the big platforms sense the turning tide. Instagram has begun emphasizing DMs, X is pushing subscriber-only circles and TikTok is experimenting with private communities. Behind these developments is an implicit acknowledgement that the infinite scroll, stuffed with bots and synthetic sludge, is approaching the limit of what humans will tolerate....

The most radical redesign of social media might be the most familiar: What if we treated these platforms as public utilities rather than private casinos...? Imagine social media platforms with transparent algorithms subject to public audit, user representation on governance boards, revenue models based on public funding or member dues rather than surveillance advertising, mandates to serve democratic discourse rather than maximize engagement, and regular impact assessments that measure not just usage but societal effects... This could take multiple forms, like municipal platforms for local civic engagement, professionally focused networks run by trade associations, and educational spaces managed by public library systems... We need to "rewild the internet," as Maria Farrell and Robin Berjon mentioned in a Noema essay.

We need governance scaffolding, shared institutions that make decentralization viable at scale... [R]eal change will come when platforms are rewarded for serving the public interest. This could mean tying tax breaks or public procurement eligibility to the implementation of transparent, user-controllable algorithms. It could mean funding research into alternative recommender systems and making those tools open-source and interoperable. Most radically, it could involve certifying platforms based on civic impact, rewarding those that prioritize user autonomy and trust over sheer engagement.
"Social media as we know it is dying, but we're not condemned to its ruins. We are capable of building better — smaller, slower, more intentional, more accountable — spaces for digital interaction, spaces..."

"The last days of social media might be the first days of something more human: a web that remembers why we came online in the first place — not to be harvested but to be heard, not to go viral but to find our people, not to scroll but to connect. We built these systems, and we can certainly build better ones."

One of the worlds in the TRAPPIST-1 system, a mere 40 light-years away, just might be clad in a life-supporting atmosphere," reports ScienceAlert.

"In exciting new JWST observations, the Earth-sized exoplanet TRAPPIST-1e shows hints of a gaseous envelope similar to our own, one that could facilitate liquid water on the surface." Although the detection is ambiguous and needs extensive follow-up to find out what the deal is, it's the closest astronomers have come yet in their quest to find a second Earth... [T]he first step is finding exoplanets that are the right distance from their host star, occupying a zone where water neither freezes under extreme cold nor evaporates under extreme heat. Announced in 2016, the discovery of the TRAPPIST-1 system was immediately exciting for this reason. The red dwarf star hosts seven exoplanets that have a rocky composition (as opposed to gas or ice giants), several of which are bang in the star's habitable, liquid water zone...

Red dwarf stars are also much more active than Sun-like stars, rampant with flare activity that, scientists have speculated, may have stripped any planetary atmospheres in the vicinity. Closer inspections of TRAPPIST-1d, one of the other worlds in the star's habitable zone, have turned up no trace of an atmosphere. But TRAPPIST-1e is a little more comfortably located, at a slightly greater distance from the star... [T]he spectrum is consistent with an atmosphere rich in molecular nitrogen, with trace amounts of carbon dioxide and methane.

This is pretty tantalizing. Earth's atmosphere is roughly 78 percent molecular nitrogen. If the results can be validated, TRAPPIST-1e might just be the most Earth-like exoplanet discovered to date. That is not a small if, though. Luckily, more JWST observations are in the pipeline, and the researchers should be able to validate or rule out an atmosphere very soon.
After analyzing four transits of TRAPPIST-1e across TRAPPIST-1, "We are seeing two possible explanations," says astrophysicist Ryan MacDonald of the University of St Andrews in the UK. "The most exciting possibility is that TRAPPIST-1e could have a so-called secondary atmosphere containing heavy gases like nitrogen. "But our initial observations cannot yet rule out a bare rock with no atmosphere..."

Astrophysicist Ana Glidden of MIT led the second team interpreting the results, and says "We are really still in the early stages of learning what kind of amazing science we can do with Webb. It's incredible to measure the details of starlight around Earth-sized planets 40 light-years away and learn what it might be like there, if life could be possible there."

"We're in a new age of exploration that's very exciting to be a part of."

Threads now has more than 400 million monthly active users. But who are these people who are actually using Threads, asks Mashable? And what is their cultural footprint? Threads is the Big Bang Theory of social media. Bland, boring, largely unoffensive, and somehow, it was the most popular show on television for years... At any given time, "Twitter" and "X" are searched somewhere between 12 and 30 times more than "Threads" on Google, according to the search engine's Trends data. Threads is a popular platform without much of an identity...

[Threads] is consistently good at one thing users really want from a social media platform: for their posts to be seen and engaged with. Threads might be boring in comparison to its competitors, but its users say it might be the only place on the internet right now where they don't feel they are screaming into the void.... Much like TikTok, you don't actually have to have thousands of followers to find decent engagement on the app. One user, commenting in a Reddit forum questioning who actually uses the app, said they "find it worthwhile" because "you can just say stuff on there under a tag and people will find it and respond...." According to consumer research company GWI, while users signed up for Threads because of its integration with Instagram, they're staying because Threads users are "community-focused," noting there's a strong overlap between Discord users and Threads users....

It just doesn't have the same flair as X or Twitter, which could be because Adam Mosseri, the head of Instagram, went out of his way to ensure politics was downplayed when Threads first launched. (Meta has since backtracked slightly by phasing "civic content" back into Threads "with a more personalized approach....") Threads is still in its adolescence. It lacks the media ecosystem that made Twitter indispensable for journalists, politicians, and celebrities. But it has something else: sheer scale and Meta's backing. With Instagram's 2 billion users as a feeder system, Meta can keep funneling people toward Threads whether they like it or not.
The article also points out Threads is integrated with the fediverse, supporting ActivityPub's decentralized protocol...

An anonymous reader quotes a report from ScientificAmerican: After a brain stem stroke left him almost entirely paralyzed in the 1990s, French journalist Jean-Dominique Bauby wrote a book about his experiences -- letter by letter, blinking his left eye in response to a helper who repeatedly recited the alphabet. Today people with similar conditions often have far more communication options. Some devices, for example, track eye movements or other small muscle twitches to let users select words from a screen. And on the cutting edge of this field, neuroscientists have more recently developed brain implants that can turn neural signals directly into whole words. These brain-computer interfaces (BCIs) largely require users to physically attempt to speak, however -- and that can be a slow and tiring process. But now a new development in neural prosthetics changes that, allowing users to communicate by simply thinking what they want to say.

The new system relies on much of the same technology as the more common "attempted speech" devices. Both use sensors implanted in a part of the brain called the motor cortex, which sends motion commands to the vocal tract. The brain activation detected by these sensors is then fed into a machine-learning model to interpret which brain signals correspond to which sounds for an individual user. It then uses those data to predict which word the user is attempting to say. But the motor cortex doesn't only light up when we attempt to speak; it's also involved, to a lesser extent, in imagined speech. The researchers took advantage of this to develop their "inner speech" decoding device and published the results on Thursday in Cell. The team studied three people with amyotrophic lateral sclerosis (ALS) and one with a brain stem stroke, all of whom had previously had the sensors implanted. Using this new "inner speech" system, the participants needed only to think a sentence they wanted to say and it would appear on a screen in real time. While previous inner speech decoders were limited to only a handful of words, the new device allowed participants to draw from a dictionary of 125,000 words. To help keep private thoughts private, the researchers implemented a code phrase "chitty chitty bang bang" that participants could use to prompt the BCI to start or stop transcribing.

AOL (now a Yahoo subsidiary) just announced its dial-up internet service will be discontinued at the end of September.

"The change also means the retirement of the AOL Dialer software and the AOL Shield browser, both designed for older operating systems and slow connections that relied on the familiar screech of a modem handshake," remembers Slashdot reader BrianFagioli (noting that dial-up Internet "was once the gateway to the web for millions of households, back when speeds were measured in kilobits and waiting for a picture to load could feel like an eternity.")

AOL's dial-up service "has been publicly available for 34 years," writes Tom's Hardware. But AppleInsider notes the move comes more than 40 years after AOL started "as a very early Apple service." AOL itself started back in 1983 under the name Control Video Corporation, offering online services for the Atari 2600 console. After failing, it became Quantum Computer Services in 1985, eventually launching AppleLink in 1988 to connect Macintosh computers together... With the launch of PC Link for IBM-compatible PCs in 1988 and parting from Apple in October 1989, the company rebranded itself as America Online, or AOL... Even at its height, dial-up connections could get up to 56 kilobits per second under ideal conditions, while modern connections are measured in megabits and gigabits. Most of the service was also what's considered a "walled garden," with features that were only available through AOL itself and that it wasn't the actual, untamed Internet.
In the 1990s AOL "was how millions of people were introduced to the Internet," the article remembers, adding that "Even after the AOL Time Warner acquisition and the 2015 acquisition by Verizon, AOL was still a popular service. Astoundingly, it counted about two million dial-up subscribers at the time." In the 2021 acquisition of assets from Verizon by Apollo Global Management, AOL was said to have 1.5 million people paying for services. However, this was more for technical support and software, rather than for actual Internet access. A CNBC report at the time reports that the dial-up user count was "in the low thousands".... While it dies off, not with a bang but a whimper, AOL's dial-up is still remembered as one of the most transformative services in the Internet age.
"This change does not impact the numerous other valued products and services that these subscribers are able to access and enjoy as part of their plans," a Yahoo spokesperson told PC Magazine this week. "There is also no impact to our users' free AOL email accounts." AOL's disastrous 2001 merger with Time Warner and ongoing inability to deliver broadband to its customers... left it on a path to decline that acquiring such widely read sites as Engadget [2005] and TechCrunch [2010] did not stem. By 2014, the number of dial-up AOL customers had collapsed to 2.34 million. A year later, Verizon bought the company for $4.4 billion in an internet-content play that turned out to be as doomed as the Time Warner transaction. In 2021, Verizon unloaded both AOL and Yahoo, which it had separately purchased in 2017, to the private-equity firm Apollo Global Management....

The demise of AOL's dial-up service does not mean the extinction of the oldest form of consumer online access. Estimates from the Census Bureau's 2023 American Community Survey show 163,401 Americans connected to the internet via dial-up that year.

That was by far the smallest segment of the internet-using population, dwarfed by 100,166,949 subscribing to such forms of broadband as "cable, fiber optic, or DSL"; 8,628,648 using satellite; 3,318,901 using "Internet access without a subscription" (which suggests Wi-Fi from coffee shops or public libraries); and 1,445,135 via "other service."

The remaining AOL dial-up subscribers will need to find some sort of replacement, which in rural areas may be limited to fixed wireless or SpaceX's considerably more expensive Starlink. Or they may wind up joining the ranks of Americans with no internet access: 6,866,059, in those 2023 estimates.

Two fundamentally different methods for measuring the universe's expansion rate continue to produce incompatible results -- with direct observations of receding galaxies yielding approximately 73 kilometers per second per megaparsec and cosmic microwave background radiation analysis producing closer to 67 km/s/mpc.

The discrepancy, known as the Hubble tension, has strengthened annually for the past decadem, according to Duke University astronomer Dan Scolnic. The persistent disagreement prevents calculation of the universe's precise age or size. The Lambda-CDM model, which holds that dark energy and dark matter comprise 95% of the universe while visible matter constitutes just 5%, assumes dark energy's nature has remained constant since the Big Bang.

Some theorists propose dark energy's potency changes over time, while others suggest the Milky Way sits within a comparatively empty region of space. A June study using gravitational lensing of quasar light, bypassing traditional distance measurements, matched the higher value. New telescopes including the Vera Rubin Observatory and Nancy Grace Roman Space Telescope may provide additional data. Past improvements in measurement precision have only reinforced rather than resolved the tension.

An anonymous reader shared this report from Cosmos magazine about a plan to "pick up those faint signals from billions of years ago." Astronomers are planning to launch a tiny spacecraft to the far side of the Moon to listen out for "ancient whispers" in a quest to uncover the secrets of the early universe. The mission will focus on understanding the 'Cosmic Dawn', a period in the early stages of the universe after the Big Bang but before the first stars and galaxies appeared.

One of the difficulties in studying this period of the universe is that silence is essential. With all the electronics and interference in our atmosphere, Earth becomes too loud, making it unsuitable for this kind of research... The proposed mission will utilise the Moon as a giant shield, blocking out the noise from Earth, in order to observe these signals...

The mission, known as CosmoCube, is a joint study between the UK's University of Portsmouth, University of Cambridge and Rutherford Appleton Laboratory Space... CosmoCube's radio will operate at low frequencies (10-100MHz), which should hopefully be able to detect extremely faint signals. The team hope to reach lunar orbit before the end of the decade, with a roughly 5-year roadmap planned.
The article includes this quote from Professor David Bacon, from the University of Portsmouth and CosmoCube researcher. "It's incredible how far these radio waves have travelled, now arriving with news of the universe's history.

"The next step is to go to the quieter side of the Moon to hear that news."

The U.S. government has canceled a proposed $900 million project to study in unprecedented detail the afterglow of the Big Bang, the cosmic microwave background (CMB) radiation. Science magazine: Known as CMB-S4, the project envisioned new arrays of ultrasensitive microwave telescopes at the South Pole and in Chile's Atacama Desert. Their goal: to detect patterns in the ancient light that would prove the newborn universe expanded in an exponential growth spurt called cosmic inflation.

The project, which could have delivered smoking gun evidence for a key theory in cosmology, was supposed to be a joint venture between the National Science Foundation (NSF) and the Department of Energy (DOE). However, yesterday, the agencies sent an unsigned statement to the leaders of the collaboration saying the project is off. "DOE and NSF have jointly decided that they can no longer support the CMB-S4 Project," it reads.

The James Webb Space Telescope has discovered the most distant galaxy ever observed, named MoM z14. NASA estimates it existed just 280 million years after the Big Bang. Space.com reports: Prior to the discovery of MoM z14, the galaxy holding the title of earliest and distant was JADES-GS-z14-0, which existed just 300 million years after the Big Bang, or around 13.5 billion years ago. This previous record galaxy has a redshift of z =14.32, while MoM z14 has a redshift of z = 14.44. There is a wider context to the observation of MoM z14 than the fact that it has broken the record for earliest known galaxy by 20 million years, though, as [explained team member and Yale University professor of Astronomy and Physics Pieter van Dokkum].

The researchers were able to determine that MoM z14 is around 50 times smaller than the Milky Way. The team also measured emission lines from the galaxy, indicating the presence of elements like nitrogen and carbon. "The emission lines are unusual; it indicates that the galaxy is very young, with a rapidly increasing rate of forming new stars," van Dokkum said. "There are also indications that there is not much neutral hydrogen gas surrounding the galaxy, which would be surprising: the very early universe is expected to be filled with neutral hydrogen. "That needs even better spectra and more galaxies, to investigate more fully."

The presence of carbon and nitrogen in MoM z14 indicates that there are earlier galaxies to be discovered than this 13.52 billion-year-old example. That is because the very earliest galaxies in the universe and their stars were filled with the simplest elements in the cosmos, hydrogen and helium. Later galaxies would be populated by these heavier elements, which astronomers somewhat confusingly call "metal," as their stars forged them and then dispersed them in supernova explosions. The research has been published on arXiv.

Adam Riess won a Nobel Prize in Physics for helping discover that the universe's acceleration is expanding, remembers The Atlantic. But then theorists "proposed the existence of dark energy: a faint, repulsive force that pervades all of empty space... the final piece to what has since come to be called the 'standard model of cosmology.'"

Riess thinks instead we should just replace the standard model: When I visited Riess, back in January, he mentioned he was looking forward to a data release from the Dark Energy Spectroscopic Instrument, a new observatory on Kitt Peak, in Arizona's portion of the Sonoran Desert. DESI has 5,000 robotically controlled optic fibers. Every 20 minutes, each of them locks onto a different galaxy in the deep sky. This process is scheduled to continue for a total of five years, until millions of galaxies have been observed, enough to map cosmic expansion across time... DESI's first release, last year, gave some preliminary hints that dark energy was stronger in the early universe, and that its power then began to fade ever so slightly. On March 19, the team followed up with the larger set of data that Riess was awaiting. It was based on three years of observations, and the signal that it gave was stronger: Dark energy appeared to lose its kick several billion years ago.

This finding is not settled science, not even close. But if it holds up, a "wholesale revision" of the standard model would be required [says Colin Hill, a cosmologist at Columbia University. "The textbooks that I use in my class would need to be rewritten." And not only the textbooks — the idea that our universe will end in heat death has escaped the dull, technical world of academic textbooks. It has become one of our dominant secular eschatologies, and perhaps the best-known end-times story for the cosmos. And yet it could be badly wrong. If dark energy weakens all the way to zero, the universe may, at some point, stop expanding. It could come to rest in some static configuration of galaxies. Life, especially intelligent life, could go on for a much longer time than previously expected.

If dark energy continues to fade, as the DESI results suggest is happening, it may indeed go all the way to zero, and then turn negative. Instead of repelling galaxies, a negative dark energy would bring them together into a hot, dense singularity, much like the one that existed during the Big Bang. This could perhaps be part of some larger eternal cycle of creation and re-creation. Or maybe not. The point is that the deep future of the universe is wide open...
"Many new observations will come, not just from DESI, but also from the new Vera Rubin Observatory in the Atacama Desert, and other new telescopes in space. On data-release days for years to come, the standard model's champions and detractors will be feverishly refreshing their inboxes..." And Riess tells The Atlantic he's disappointed when complacent theorists just tell him "Yeah, that's a really hard problem."

He adds, "Sometimes, I feel like I am providing clues and killing time while we wait for the next Einstein to come along."

New submitter salyavin writes: The final issue of Linux Format has been released. After 25 years the magazine is going out with a bang. Interviewing the old staff members, and looking back at old Linux distros [...] The last 10-15 years have been absolutely brutal to computer hobbyist magazines -- (or magazines and media at large, in general).

It's America's biggest box office for a Memorial Day weekend ever, reports Variety.

And it's been more than a decade since this many Americans went to see a movie during a three-day weekend... Families turned out in force for Disney's live-action "Lilo & Stitch" remake, which collected a blockbuster $145.5 million in its opening weekend and an estimated $183 million through Monday... Meanwhile, older audiences showed up to watch Paramount and Skydance's "Mission: Impossible — The Final Reckoning," which earned a series-best $63 million over the weekend and an estimated $77 million through Monday's holiday. This eighth installment just narrowly beat 2018's "Mission: Impossible — Fallout" ($61 million) to score the top debut of the 29-year-old franchise...

Thanks to effective counterprogramming — and a huge assist by holdovers like "Final Destination Bloodlines," "Thunderbolts*" and "Sinners" — this weekend delivered the best collective Memorial Day weekend haul with $322 million... Cinema operators are rejoicing because Memorial Day is the official launch to summer movie season, which is the most profitable stretch for the movie business. (Historically, the four-month period has accounted for $4 billion, or around 40% of the annual box office.)

It's a huge improvement from last year, which started with a whimper rather than a bang as "Furiosa: A Mad Max Saga" and "Garfield" led the holiday's worst showing in three decades with $132 million collectively. "Every film on the release calendar for the rest of the summer is going to benefit from the momentum created over this monumental record-breaking Memorial weekend in theaters," says senior Comscore analyst Paul Dergarabedian.
But the top-earning movie of the year so far is A Minecraft Movie, which has apparently brought in over $940 million.

Meanwhile, Mission Impossible: The Final Reckoning is one of the most expensive films of all time, according to the article, costing $400 million as Tom Cruise and the movie's director "worked through a pandemic and two strikes, all while grappling with inflation." Though the film received a high "A-" grade on CinemaScore, a movie industry analyst tells Variety that the unexpectedly high production costs means the movie "will be lucky to break-even."

Fun fact: A quarter of a century ago, CmdrTaco reviewed a new movie called Mission: Impossible 2, calling it "a fun movie," but "no Gladiator" and sort of a "James Bond for Dummies" movie.

"The 'Plot' is really just an excuse to show us lots of explosions, car/motorcycle/helicoptor chases..."

Dartmouth researchers propose that dark matter originated from massless, light-like particles in the early universe that rapidly condensed into massive particles through a spin-based interaction. Phys.Org reports: [T]he study authors write that their theory is distinct because it can be tested using existing observational data. The extremely low-energy particles they suggest make up dark matter would have a unique signature on the cosmic microwave background, or CMB, the leftover radiation from the Big Bang that fills all of the universe. "Dark matter started its life as near-massless relativistic particles, almost like light," says Robert Caldwell, a professor of physics and astronomy and the paper's senior author. "That's totally antithetical to what dark matter is thought to be -- it is cold lumps that give galaxies their mass," Caldwell says. "Our theory tries to explain how it went from being light to being lumps."

Hot, fast-moving particles dominated the cosmos after the burst of energy known as the Big Bang that scientists believe triggered the universe's expansion 13.7 billion years ago. These particles were similar to photons, the massless particles that are the basic energy, or quanta, of light. It was in this chaos that extremely large numbers of these particles bonded to each other, according to Caldwell and Guanming Liang, the study's first author and a Dartmouth senior. They theorize that these massless particles were pulled together by the opposing directions of their spin, like the attraction between the north and south poles of magnets. As the particles cooled, Caldwell and Liang say, an imbalance in the particles' spins caused their energy to plummet, like steam rapidly cooling into water. The outcome was the cold, heavy particles that scientists think constitute dark matter. The findings have been published in the journal Physical Review Letters.

NASA's SPHEREx space observatory has officially begun its two-year mission to map the entire sky in 102 infrared wavelengths, capturing about 3,600 images daily to create 3D maps of hundreds of millions of galaxies. Its goal is to unlock new insights into cosmic inflation, the origins of galaxies, and the building blocks of life in the Milky Way by using spectroscopy to analyze light and matter across the universe. From a press release: From its perch in Earth orbit, SPHEREx peers into the darkness, pointing away from the planet and the Sun. The observatory will complete more than 11,000 orbits over its 25 months of planned survey operations, circling Earth about 14.5 times a day. It orbits Earth from north to south, passing over the poles, and each day it takes images along one circular strip of the sky. As the days pass and the planet moves around the Sun, SPHEREx's field of view shifts as well so that after six months, the observatory will have looked out into space in every direction.

When SPHEREx takes a picture of the sky, the light is sent to six detectors that each produces a unique image capturing different wavelengths of light. These groups of six images are called an exposure, and SPHEREx takes about 600 exposures per day. When it's done with one exposure, the whole observatory shifts position -- the mirrors and detectors don't move as they do on some other telescopes. Rather than using thrusters, SPHEREx relies on a system of reaction wheels, which spin inside the spacecraft to control its orientation.

Hundreds of thousands of SPHEREx's images will be digitally woven together to create four all-sky maps in two years. By mapping the entire sky, the mission will provide new insights about what happened in the first fraction of a second after the big bang. In that brief instant, an event called cosmic inflation caused the universe to expand a trillion-trillionfold.