Google has partnered with Indian startup Varaha to purchase 100,000 tons of carbon dioxide removal credits by 2030, marking its largest deal in India and the largest involving biochar, a carbon removal solution made from biomass. TechCrunch reports: The offtake agreement credits will be delivered to Google by 2030 from Varaha's industrial biochar project in the western Indian state of Gujarat, the two firms said on Thursday. [...] Biochar is produced in two ways: artisanal and industrial. The artisanal method is community-driven, where farmers burn crop residue in conical flasks without using machines. In contrast, industrial biochar is made using large reactors that process 50-60 tons of biomass daily.

Varaha's project will generate industrial biochar from an invasive plant species, Prosopis Juliflora, using its pyrolysis facility in Gujarat. The invasive species impacts plant biodiversity and has overtaken grasslands used for livestock. Varaha will harvest the plant and make efforts to restore native grasslands in the region, the company's co-founder and CEO Madhur Jain said in an interview. Once the biochar is produced, a third-party auditor will submit their report to Puro.Earth to generate credits. Although biochar is seen as a long-term carbon removal solution, its permanence can vary between 1,000 and 2,500 years depending on production and environmental factors.

Jain told TechCrunch that Varaha tried using different feedstocks and different parameters within its reactors to find the best combination to achieve permanence close to 1,600 years. The startup has also built a digital monitoring, reporting and verification system, integrating remote sensing to monitor biomass availability. It even has a mobile app that captures geo-tagged, time-stamped images to geographically document activities, including biomass excavation and biochar's field application. With its first project, Varaha said it processed at least 40,000 tons of biomass and produced 10,000 tons of biochar last year.

Nearly three-quarters of all known bacterial species have never been studied in scientific literature, while just 10 species account for half of all published research, according to a new analysis published on bioRxiv.

The study of over 43,000 bacterial species found that E. coli dominates with 21% of all publications, followed by human pathogens like Staphylococcus aureus. Microbes crucial for human health and Earth's ecosystems remain largely unexplored, University of Michigan biologist Paul Jensen reported.

A new $1-million project by non-profit Align to Innovate aims to help close this gap by studying 1,000 microbes under varying conditions.

An anonymous reader quotes a report from Ars Technica, written by Benj Edwards: While worrying about AI takeover might seem like a modern idea that sprung from War Games or The Terminator, it turns out that a similar concern about machine dominance dates back to the time of the American Civil War, albeit from an English sheep farmer living in New Zealand. Theoretically, Abraham Lincoln could have read about AI takeover during his lifetime. On June 13, 1863, a letter published (PDF) in The Press newspaper of Christchurch warned about the potential dangers of mechanical evolution and called for the destruction of machines, foreshadowing the development of what we now call artificial intelligence—and the backlash against it from people who fear it may threaten humanity with extinction. It presented what may be the first published argument for stopping technological progress to prevent machines from dominating humanity.

Titled "Darwin among the Machines," the letter recently popped up again on social media thanks to Peter Wildeford of the Institute for AI Policy and Strategy. The author of the letter, Samuel Butler, submitted it under the pseudonym Cellarius, but later came to publicly embrace his position. The letter drew direct parallels between Charles Darwin's theory of evolution and the rapid development of machinery, suggesting that machines could evolve consciousness and eventually supplant humans as Earth's dominant species. "We are ourselves creating our own successors," he wrote. "We are daily adding to the beauty and delicacy of their physical organisation; we are daily giving them greater power and supplying by all sorts of ingenious contrivances that self-regulating, self-acting power which will be to them what intellect has been to the human race. In the course of ages we shall find ourselves the inferior race."

In the letter, he also portrayed humans becoming subservient to machines, but first serving as caretakers who would maintain and help reproduce mechanical life—a relationship Butler compared to that between humans and their domestic animals, before it later inverts and machines take over. "We take it that when the state of things shall have arrived which we have been above attempting to describe, man will have become to the machine what the horse and the dog are to man... we give them whatever experience teaches us to be best for them... in like manner it is reasonable to suppose that the machines will treat us kindly, for their existence is as dependent upon ours as ours is upon the lower animals," he wrote. The text anticipated several modern AI safety concerns, including the possibility of machine consciousness, self-replication, and humans losing control of their technological creations. These themes later appeared in works like Isaac Asimov's The Evitable Conflict, Frank Herbert's Dune novels (Butler possibly served as the inspiration for the term "Butlerian Jihad"), and the Matrix films. "Butler's letter dug deep into the taxonomy of machine evolution, discussing mechanical 'genera and sub-genera' and pointing to examples like how watches had evolved from 'cumbrous clocks of the thirteenth century' -- suggesting that, like some early vertebrates, mechanical species might get smaller as they became more sophisticated," adds Ars. "He expanded these ideas in his 1872 novel Erewhon, which depicted a society that had banned most mechanical inventions. In his fictional society, citizens destroyed all machines invented within the previous 300 years."

The University of Colorado Boulder's magazine recently wrote: What happened during the "Snowball Earth" period is perplexing: Just as the planet endured about 100 million years of deep freeze, with a thick layer of ice covering most of Earth and with low levels of atmospheric oxygen, forms of multicellular life emerged. Why? The prevailing scientific view is that such frigid temperatures would slow rather than speed evolution. But fossil records from 720 to 635 million years ago show an evolutionary spurt preceding the development of animals...

Carl Simpson, a macroevolutionary paleobiologist at CU Boulder, has found evidence that cold seawater could have jump-started — rather than suppressed — evolution from single-celled to multicellular life forms.
That evidence is described in Quanta magazine: Simpson proposes an answer linked to a fundamental physical fact: As seawater gets colder, it gets more viscous, and therefore more difficult for very small organisms to navigate. Imagine swimming through honey rather than water... To test the idea, Simpson, a paleobiologist at the University of Colorado, Boulder, and his team conducted an experiment designed to see what a modern single-celled organism does when confronted with higher viscosity... In an enormous, custom-made petri dish, [grad student Andrea] Halling and Simpson created a bull's-eye target of agar gel — their own experimental gauntlet of viscosity. At the center, it was the standard viscosity used for growing these algae in the lab. [Green algae, which swims with a tail-like flagellum.] Moving outward, each concentric ring had higher and higher viscosity, finally reaching a medium with four times the standard level. The scientists placed the algae in the middle, turned on a camera, and left them alone for 30 days — enough time for about 70 generations of algae to live, swim around for nutrients and die...

After 30 days, the algae in the middle were still unicellular. As the scientists put algae from thicker and thicker rings under the microscope, however, they found larger clumps of cells. The very largest were wads of hundreds. But what interested Simpson the most were mobile clusters of four to 16 cells, arranged so that their flagella were all on the outside. These clusters moved around by coordinating the movement of their flagella, the ones at the back of the cluster holding still, the ones at the front wriggling.
"One thing that you learn about small organisms from a physics point of view is that they don't experience the world the same way that we do, as larger-bodied organisms," Simpson says in the university's article. It says that instead unicellular organisms are specifically "affected by the viscosity, or thickness, of sea water," and Simpson adds that "basically, that would trigger the origin of animals, potentially."

Last year Simpson posted a preprint on biorxiv.org. (And he also co-authored an article on "physical constraints during Snowball Earth drive the evolution of multicellularity.")

There's a video showing algae in Simpson's lab clumping together in viscous water. "This observed behavior adds evidence to Simpson's hypothesis that single-celled organisms clumped together to their mutual advantage during the 'Snowball Earth' period," says the video's description, "thus adding momentum to the rise of multicellular organisms." But Simpson says in the university's article, "To actually see it empirically means there's something to this idea."

Simpson and colleagues have now received a $1 million grant to study grains of sand made from calcium carbonate and called ooids, since their diameter "could be a proxy measurement of Earth's temperature for the last 2.5 billion years," according to the university's article. Geologist Lizzy Trower says the research "can tell us something about the chemistry and water temperature in which they formed." And more importantly, "Does the fossil record agree with the predictions we would make based on this theory from this new record of temperature?" Trower and Simpson's work also has potential implications for the human quest to find life elsewhere in the universe, Trower said. If extremely harsh and cold environments can spur evolutionary change, "then that is a really different type of thing to look for in exoplanets (potentially life-sustaining planets in other solar systems), or think about when and where (life) would exist."

MicroStrategy's bitcoin holdings and a tech investment fund are commanding extraordinary premiums in U.S. markets, highlighting unusual price anomalies reminiscent of past market distortions. MicroStrategy shares are trading at more than double the market value of their main asset -- bitcoin holdings -- while closed-end fund Destiny Tech100 recently traded at 11 times its net asset value, down from 21 times earlier in 2024.

Similar market irregularities have emerged throughout history. In 1923, investor Benjamin Graham profited from a disconnect between DuPont and General Motors shares. During the 1929 bull market, closed-end fund Capital Administration Co. traded at a 1,235% premium to its net asset value. WSJ adds: The PalmPilot during the 1990s and early 2000s was a hand-held device and personal assistant that came with a touch-screen display and a stylus. Palm was the biggest maker of hand-held computer devices, with 70% market share, and it held its initial public offering in March 2000, about a week before the Nasdaq Composite Index's peak during the dot-com bubble.

Palm's shares jumped 150% on their first day of trading, giving Palm a stock-market value of about $53 billion. Palm was still 94%-owned by parent 3Com at the time. Yet on Palm's first day of trading, 3Com's shares fell 21%.

The funny part: According to the stock market, 3Com was worth about $23 billion less than the value of the Palm shares that 3Com owned. This made no sense, yet the valuations remained out of whack for months. In time, both stocks came down to earth, sanity prevailed and the world eventually moved on to smartphones.

The climate crisis is "wreaking havoc" on the planet's water cycle, with ferocious floods and crippling droughts affecting billions of people, a report has found. The Guardian: Water is people's most vital natural resource but global heating is changing the way water moves around the Earth. The analysis of water disasters in 2024, which was the hottest year on record, found they had killed at least 8,700 people, driven 40 million from their homes and caused economic damage of more than $550bn.

Rising temperatures, caused by continued burning of fossil fuels, disrupt the water cycle in multiple ways. Warmer air can hold more water vapour, leading to more intense downpours. Warmer seas provide more energy to hurricanes and typhoons, supercharging their destructive power. Global heating can also increase drought by causing more evaporation from soil, as well as shifting rainfall patterns.

Deadly flash floods hit Nepal and Brazil in 2024, while river flooding caused devastation in central Europe, China and Bangladesh. Super Typhoon Yagi, which struck south-east Asia in September, was intensified by the climate crisis, as was Storm Boris which hit Europe the same month. Droughts also caused major damage, with crop production in southern Africa halving, causing more than 30 million people to face food shortages. Farmers were also forced to cull livestock as their pastures dried up, and falling output from hydropower dams led to widespread blackouts.

This week New York Times technology columnist Kevin Roose published his annual "Good Tech" awards to "shine the spotlight on a few tech projects that I think contributed positively to humanity."

And high on the list is "Andres Freund, and every open-source software maintainer saving us from doom." The most fun column I wrote this past year was about a Microsoft database engineer, Andres Freund, who got some odd errors while doing routine maintenance on an obscure open-source software package called xz Utils. While investigating, Freund inadvertently discovered a huge security vulnerability in the Linux operating system, which could have allowed a hacker to take control of hundreds of millions of computers and bring the world to its knees.

It turns out that much of our digital infrastructure rests on similar acts of nerdy heroism. After writing about Freund's discovery, I received tips about other near disasters involving open-source software projects, many of which were averted by sharp-eyed volunteers catching bugs and fixing critical code just in time to foil the bad guys. I could not write about them all, but this award is to say: I see you, open-source maintainers, and I thank you for your service.
Roose also acknowledges the NASA engineers who kept Voyager 1 transmitting back to earth from interstellar space — and Bluesky, "for making my social media feeds interesting again."

Roose also notes it was a big year for AI. There's a shout-out to Epoch AI, a small nonprofit research group in Spain, "for giving us reliable data on the AI boom." ("The firm maintains public databases of AI models and AI hardware, and publishes research on AI trends, including an influential report last year about whether AI models can continue to grow at their current pace. Epoch AI concluded they most likely could until 2030.") And there's also a shout-out to groups "pushing AI forward" and positive uses "to improve health care, identify new drugs and treatments for debilitating diseases and accelerate important scientific research."

• The nonprofit Arc Institute released Evo, an AI model that "can predict and generate genomic sequences, using technology similar to the kind that allows systems like ChatGPT to predict the next words in a sequence."

• A Harvard University lab led by Dr. Jeffrey Lichtman teamed with researchers from Google for "the most detailed map of a human brain sample ever created. The team used AI to map more than 150 million synapses in a tiny sample of brain tissue at nanometer-level resolution..."

• Researchers at Stanford and McMaster universities developed SyntheMol, "a generative AI model that can design new antibiotics from scratch."

"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.

It's weighs less than 15 pounds. It's 17 inches wide. And in June Elon Musk said it was "easily carried in a backpack. This product will change the world."

And now, CNET reports: Calling all digital nomads and van-lifers: SpaceX's Starlink Mini is now available everywhere in the US. The small antenna costs $599 and requires a monthly subscription of either $50 or $165, depending on which plan you choose. Thanks to thousands of low Earth orbit satellites, Starlink has the unique ability to send high-speed internet just about anywhere. Standard service is great for home internet in rural areas, while the provider's Roam service and new portable dish are ideal for staying connected on the go...

The Mini is a satellite dish and Wi-Fi router all in one that's about the size of a laptop. According to Starlink's website, it uses approximately half the power of Starlink's standard dish. It can be powered with a portable USB battery and can "melt snow and withstand sleet, heavy rain and harsh winds."
The article adds that users "can connect up to 128 devices, and it promises low latency... According to Starlink's broadband labels, your download speeds typically range from 30 to 100Mbps and 5 to 25Mbps in upload."

If we dissolve acid-neutralizing rocks in the ocean, will it absorb more carbon dioxide?

Climate ventures and philanthropic funders have been spending millions of dollars to find out, reports the Washington Post. "Researchers have been exploring this technology for the last five years, but over the last two months, at least a couple of start-ups have begun operation along the Atlantic and Pacific coasts." Planetary, a start-up based in Nova Scotia, removed 138 metric tons of carbon last month for Shopify and Stripe. The start-up Ebb Carbon is running a small site in Washington that can remove up to 100 carbon metric tons per year and committed in October to remove 350,000 metric tons of carbon from the atmosphere over the next decade for Microsoft.

Proponents of the technology say it's one of the most promising forms of carbon removal, which experts say will be necessary to meet climate goals even as the world cuts emissions. But in order for this to make a dent, it will need to be scaled up to remove billions, not hundreds of thousands, of metric tons of carbon per year, Yale associate professor of earth and planetary sciences Matthew Eisaman said... Removing carbon could also help prevent ocean acidification. Although the ocean's chemistry has varied through geologic time, it has become more acidic as it has absorbed more carbon from human-generated emissions, said Andy Jacobson, a geochemist at Northwestern University. The increased acidity makes it difficult for some marine organisms to build their skeletons and shells...

Researchers are still investigating the best strategy to implement the method. Ebb Carbon, for example, takes existing saltwater waste streams from treatment and desalination plants and uses electricity to alkalize it before returning it to the ocean, said Eisaman, who is the start-up's co-founder and chief scientist. Another method is depositing alkaline minerals or solution into the ocean using a ship; others want to enhance the rock weathering that already occurs on the coast...

The growing evidence from early studies in labs and controlled outdoor settings suggest no serious impacts on plankton, which are at the bottom of the food web.

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."

In 2025, China plans to start building a demonstration thorium-based molten-salt reactor in the Gobi Desert. IEEE Spectrum reports: The 10-megawatt reactor project, managed by the Chinese Academy of Sciences' Shanghai Institute of Applied Physics (SINAP), is scheduled to be operational by 2030, according to an environmental-impact report released by the Academy in October. The project follows a 2-MW experimental version completed in 2021 and operated since then. China's efforts put it at the forefront of both thorium-based fuel breeding and molten-salt reactors. Several companies elsewhere in the world are developing plans for this kind of fuel or reactor, but none has yet operated one. Prior to China's pilot project, the last operating molten-salt reactor was Oak Ridge National Laboratory's Molten Salt Reactor Experiment, which ran on uranium. It shut down in 1969.

Thorium-232, found in igneous rocks and heavy mineral sands, is more abundant on Earth than the commonly used isotope in nuclear fuel, uranium-235. But this weakly radioactive metal isn't directly fissile -- it can't undergo fission, the splitting of atomic nuclei that produces energy. So it must first be transformed into fissile uranium-233. That's technically feasible, but whether it's economical and practical is less clear. The attraction of thorium is that it can help achieve energy self-sufficiency by reducing dependence on uranium, particularly for countries such as India with enormous thorium reserves. But China may source it in a different way: The element is a waste product of China's huge rare earth mining industry. Harnessing it would provide a practically inexhaustible supply of fuel. Already, China's Gansu province has maritime and aerospace applications in mind for this future energy supply, according to the state-run Xinhua News Agency.

Scant technical details of China's reactor exist, and SINAP didn't respond to IEEE Spectrum's requests for information. The Chinese Academy of Sciences' environmental-impact report states that the molten-salt reactor core will be 3 meters in height and 2.8 meters in diameter. It will operate at 700 C and have a thermal output of 60 MW, along with 10 MW of electricity. [...] But many challenges come along with thorium use. A big one is dealing with the risk of proliferation. When thorium is transformed into uranium-233, it becomes directly usable in nuclear weapons. "It's of a quality comparable to separated plutonium and is thus very dangerous," says Edwin Lyman, director of nuclear power safety at the Union of Concerned Scientists in Washington, D.C. If the fuel is circulating in and out of the reactor core during operation, this movement introduces routes for the theft of uranium-233, he says.

The Washington Post shares some good news from 2024: Researchers were able to detect a significant dip in atmospheric levels of hydrochlorofluorocarbons — harmful gases that deplete the ozone layer — for the first time, almost 30 years after countries first agreed to phase out the chemicals.

A new satellite launched in March to track and publicly reveal the biggest methane polluters in the oil and gas industry — an important step in tackling the greenhouse gas that accounts for almost a third of global warming. The NASA/Carbon Mapper satellite, which measures CO2 and methane emissions, also launched, providing detailed images from individual oil and gas facilities across the world.

Back on Earth, the world's largest plant for pulling carbon dioxide out of the atmosphere opened in Iceland. Norway became the first country to have more electric than gas-powered vehicles, while one Japanese island began using a new generation of batteries to help stockpile massive amounts of clean electricity.

There were also small but important victories for animal conservation. The Iberian lynx, a European wildcat once on the brink of extinction, is no longer classed as an "endangered" species — in what experts have hailed as the "greatest recovery of a cat species ever achieved through conservation...."

Despite a large number of powerful tornadoes to hit the United States in early 2024, the death tolls were fortunately not as high as meteorologists feared, in part due to improved forecasting technology.
The article also notes America's Food and Drug Administration approved a new therapy which uses a patients' own cells to attack skin cancer for adults for whom surgery isn't an option. "Experts said the decision could open the door to similar treatments for far more common cancers."

And one more inspiring story from 2024: 105-year-old Virginia Hislop, of Yakima, Washington received her master's degree from Stanford University...

Following its record-breaking closest approach to the Sun, NASA's Parker Solar Probe has transmitted a beacon tone back to Earth indicating it's in good health and operating normally. NASA: The mission operations team at the Johns Hopkins Applied Physics Laboratory (APL) in Laurel, Maryland received the signal just before midnight EST, on the night of Dec. 26. The team was out of contact with the spacecraft during closest approach, which occurred on Dec. 24, with Parker Solar Probe zipping just 3.8 million miles from the solar surface while moving about 430,000 miles per hour.

The spacecraft is expected to send back detailed telemetry data on its status on Jan. 1. This close-up study of the Sun allows Parker Solar Probe to take measurements that help scientists better understand how material in this region gets heated to millions of degrees, trace the origin of the solar wind (a continuous flow of material escaping the Sun), and discover how energetic particles are accelerated to near light speed. Previous close passes have helped scientists pinpoint the origins of structures in the solar wind and map the outer boundary of the Sun's atmosphere.

NASA's Parker Solar Probe made a historic approach on Christmas Eve, flying within 3.8 million miles of the Sun at a record-breaking speed of 430,000 mph. It marks humanity's closest encounter with a star. Live Science reports: Mission control cannot communicate with the probe during this rendezvous due to its vicinity to the sun, and will only know how the spacecraft fared in the early hours of Dec. 27 after a beacon signal confirms both the flyby's success and the overall state of the spacecraft. Images gathered during the flyby will beam home in early January, followed by scientific data later in the month when the probe swoops further away from the sun, Nour Rawafi, who is the project scientist for the mission, told reporters at the Annual Meeting of the American Geophysical Union (AGU) earlier this month.

Parker launched in 2018 to help decode some of the biggest mysteries about our sun, such as why its outermost layer, the corona, heats up as it moves further from the sun's surface, and what processes accelerate charged particles to near-light speeds. In addition to revolutionizing our understanding about the sun, the probe also caught rare closeups of passing comets and studied the surface of Venus. On Christmas Eve, scientists expect the probe to have flown through plumes of plasma still attached to the sun, and hope it observed solar flares occurring simultaneously due to ramped-up turbulence on the sun's surface, which spark breathtaking auroras on Earth but also disrupt communication systems and other technology. "Right now, Parker Solar Probe has achieved what we designed the mission for," Nicola Fox, the associate administrator for NASA Science Mission Directorate at NASA Headquarters in Washington, D.C., said in a NASA video released on Dec. 24. "It's just a total 'Yay! We did it' moment."

"Sixty-six million years ago, all dinosaurs (except for birds) were wiped from the face of the Earth..." writes Gizmodo. "What's indisputable about this pivotal moment in Earth's history is that a 6.2 to 9.3-mile-wide (10 to 15-kilometer) asteroid struck what is now modern-day Mexico. Around the same time, however, volcanoes in what is now India experienced some of the largest eruptions in Earth's history."

Those volcanos "have long been proposed as an alternative cause for the demise of the dinosaurs..." writes Phys.org. But "Now, climate scientists from Utrecht University and the University of Manchester show that while the volcanism caused a temporary cold period, the effects had already worn off thousands of years before the meteorite impacted." Earth scientists have fiercely debated for decades whether a massive outpouring of lava on the Indian continent, which occurred both prior to and after the meteorite impact, also contributed to the demise of dinosaur populations roaming Earth. These volcanic eruptions released vast amounts of CO2, dust, and sulfur, thereby significantly altering the climate on Earth — but in different ways and on different timescales to a meteorite impact. The new publication provides compelling evidence that while the volcanic eruptions in India had a clear impact on global climate, they likely had little to no effect on the mass extinction of the dinosaurs.

By analyzing fossil molecules in ancient peats from the United States of America, the scientific team reconstructed air temperatures for the time period covering both the volcanic eruptions and the meteorite impact. Using this method, the researchers show that a major volcanic eruption occurred about 30,000 years before the meteor impact, coinciding with at least a 5 degrees Celsius cooling of the climate... Importantly, the scientists discovered that by around 20,000 years before the meteorite impact, temperatures on Earth had already stabilized and had climbed back to similar temperatures before the volcanic eruptions started.
The study is published in the journal Science Advances. And Gizmodo shares this quote from Bart van Dongen of The University of Manchester, who worked on the research.

"The study provides vital insights not only into the past but could also help us find ways for how we might prepare for future climate changes or natural disasters."

The world's first nuclear-powered battery — a diamond with an embedded radioactive isotope — could power small devices for thousands of years, according to scientists at the UK's University of Bristol.

Long-time Slashdot reader fahrbot-bot shared this report from LiveScience: The diamond battery harvests fast-moving electrons excited by radiation, similar to how solar power uses photovoltaic cells to convert photons into electricity, the scientists said.

Scientists from the same university first demonstrated a prototype diamond battery — which used nickel-63 as the radioactive source — in 2017. In the new project, the team developed a battery made of carbon-14 radioactive isotopes embedded in manufactured diamonds. The researchers chose carbon-14 as the source material because it emits short-range radiation, which is quickly absorbed by any solid material — meaning there are no concerns about harm from the radiation. Although carbon-14 would be dangerous to ingest or touch with bare hands, the diamond that holds it prevents any short-range radiation from escaping. "Diamond is the hardest substance known to man; there is literally nothing we could use that could offer more protection," Neil Fox, a professor of materials for energy at the University of Bristol, said in the statement...

A single nuclear-diamond battery containing 0.04 ounce (1 gram) of carbon-14 could deliver 15 joules of electricity per day. For comparison, a standard alkaline AA battery, which weighs about 0.7 ounces (20 grams), has an energy-storage rating of 700 joules per gram. It delivers more power than the nuclear-diamond battery would in the short term, but it would be exhausted within 24 hours. By contrast, the half-life of carbon-14 is 5,730 years, which means the battery would take that long to be depleted to 50% power....

[A] spacecraft powered by a carbon-14 diamond battery would reach Alpha Centauri — our nearest stellar neighbor, which is about 4.4 light-years from Earth — long before its power were significantly depleted.
The battery has no moving parts, according to the article. It "requires no maintenance, nor does it have any carbon emissions."

"Voyager 1 is currently exploring interstellar space at a distance of 15.5 billion miles (24.9 billion kilometers) away from Earth," writes Gizmodo.

And yet a team of amateur astronomers in the Netherlands was able to receive Voyager's signals on a 1950s-era telescope... The astronomers used orbital predictions of Voyager 1's position in space to correct for the Doppler shift in frequency caused by the motion of Earth, as well as the motion of the spacecraft through space... [The signal] was found live, and further analysis later confirmed that it corresponded to the position of Voyager 1.
"I did the experiment," mathematician/scientific software engineer Tammo Jan Dijkema told Slashdot in an email, as "one of a crew of four." He works at ASTRON (the Netherlands Institute for Radio Astronomy) while volunteering at the Dwingeloo radio telescope, and wants to clarify any suggestion in Gizmodo's article "that we received signals at S-band, which is not true. We received the 'normal' Voyager-1 signal at 8.4 GHz. See our blog post... The Dwingeloo reception was not related to Voyager's temporary glitch at all."

And Scientific American shares an interesting perspective on the Voyager probes: we everyday Earthlings may simplistically think of the sun as a compact distant ball of light, in part because our plush atmosphere protects us from our star's worst hazards. But in reality the sun is a roiling mass of plasma and magnetism radiating itself across billions of miles in the form of the solar wind, which is a constant stream of charged plasma that flows off our star. The sun's magnetic field travels with the solar wind and also influences the space between planets. The heliosphere grows and shrinks in response to changes in the sun's activity levels over the course of an 11-year cycle... [Jamie Rankin, a space physicist at Princeton University and deputy project scientist of the Voyager mission] notes, astronomers of all stripes are trapped within that chaotic background in ways that may or may not affect their data and interpretations. "Every one of our measurements to date, until the Voyagers crossed the heliopause, has been filtered through all the different layers of the sun," Rankin says.

On their trek to interstellar space, the Voyagers had to cross a set of boundaries: first a termination shock some seven billion or eight billion miles away from the sun, where the solar wind abruptly begins to slow, then the heliopause, where the outward pressure from the solar wind is equaled by the inward pressure of the interstellar medium. Between these two stark borders lies the heliosheath, a region where solar material continues to slow and even reverse direction. The trek through these boundaries took Voyager 1, the faster of the twin probes, nearly eight years; such is the vastness of the scale at play.

Beyond the heliopause is interstellar space, which Voyager 1 entered in 2012 and Voyager 2 reached in 2018. It's a very different environment from the one inside our heliosphere — quieter but hardly quiescent. "It's a relic of the environment the solar system was born out of," Rankin says of the interstellar medium. Within it are energetic atomic fragments called galactic cosmic rays, as well as dust expelled by dying stars across the universe's eons, among other ingredient.
Earlier this month Wired noted " The secret of the Voyagers lies in their atomic hearts: both are equipped with three radioisotope thermoelectric generators, or RTGs — small power generators that can produce power directly on board. Each RTG contains 24 plutonium-238 oxide spheres with a total mass of 4.5 kilograms..." But as time passes, the plutonium on board is depleted, and so the RTGs produce less and less energy. The Voyagers are therefore slowly dying. Nuclear batteries have a maximum lifespan of 60 years. In order to conserve the probes' remaining energy, the mission team is gradually shutting down the various instruments on the probes that are still active...

Four active instruments remain, including a magnetometer as well as other instruments used to study the galactic environment, with its cosmic rays and interstellar magnetic field. But these are in their last years. In the next decade — it's hard to say exactly when — the batteries of both probes will be drained forever.

Axiom Space has revised its plan for assembling its commercial space station by launching the Payload, Power, and Thermal module first, enabling it to operate as a free-flying platform as early as 2028 -- two years ahead of the original timeline. Space.com reports: NASA awarded Axiom Space a contract in 2020 to attach one or more modules to the International Space Station (ISS), which is set to retire by 2030 at the earliest. The original plan called for Axiom to detach a multi-module group from the ISS, creating a commercial outpost in low Earth orbit that will continue operating after the ISS is gone. But that plan has now been altered.

To create its space station, Axiom plans to launch five modules: a payload/power/thermal element, an airlock, a research/manufacturing hub, and a pair of habitat modules. The original plan was for Axiom to launch the Habitat 1 module to the ISS first, followed by the additional elements. The new assembly sequence will see the Payload, Power and Thermal module launch to the ISS first. This module could detach from the station -- and become a free flyer called Axiom Station -- as soon as 2028, according to the company. After that happens, Axiom will continue assembling the outpost, launching the Habitat 1 module to meet up with it. Habitat 1 will be followed by the airlock, the Habitat 2 module, and then the research and manufacturing facility. Angela Hart, a manager for the Commercial Low Earth Orbit Development Program at NASA's Johnson Space Center in Houston, said: "The updated assembly sequence has been coordinated with NASA to support both NASA and Axiom Space needs and plans for a smooth transition in low Earth orbit."