What if we glimpsed alien life for the first time by peering through a natural telescope made by the Sun's gravity? This wild idea, known as a solar gravitational lens (SGL) mission, may sound like an Einsteinian fever dream, but scientists have now found that it is "feasible with technologies that are either extant or in active development," according to a new study. Motherboard reports: Researchers led by Henry Helvajian, senior scientist in the Physical Sciences Laboratories at the nonprofit research center The Aerospace Corporation, have now shared the initial results of this ongoing NIAC study on the preprint server arxiv, which have not been peer-reviewed. Though the team cautioned that the mission would need to overcome several technical challenges, it could ultimately answer one of humanity's most fundamental questions: Are we alone in the universe?

"The SGL offers capabilities that are unmatched by any planned or conceivable optical instrument," according to the study, which was co-authored by Slava Turyshev, a scientist at NASA's Jet Propulsion Laboratory and principal investigator of the NIAC mission concept. "With its unique optical properties, the SGL can be used to obtain detailed, high resolution images of Earth-like exoplanets as far as 100 light years from Earth, with measurement durations lasting months, or at most a few years." "Of particular interest is the possibility of using the SGL to obtain images of high spatial and spectral resolution of a yet-to-be-identified, potentially life-bearing exoplanet in another solar system in our Galactic neighborhood," the researchers added. "The direct high-resolution images of an exoplanet obtained with the SGL could lead to insight on the on-going biological processes on the target exoplanet and find signs of habitability."

The focal point of the Sun's gravitational lens is located all the way out in interstellar space, some 550 and 900 times the distance that Earth orbits our star, which is much farther than any spacecraft has ventured beyond our planet. Helvajian and his colleagues envision their mission as consisting of a one-meter telescope that is accompanied by a sunshade and propelled by solar sails that produce thrust by capturing solar radiation, in a somewhat analogous fashion to wind-propelled sails. Even if they were able to overcome the technical hurdles involved with this concept -- which include the development of more reliable solar sails and long-duration navigation and communications systems -- the team estimated that it would take at least 25 to 30 years for a spacecraft to reach this far-flung location, in the best case scenario. That said, if a telescope were able to spot alien life, arguably the biggest breakthrough in science, it would be well worth the long wait.

An anonymous reader quotes a report from Reuters: The oldest patient yet has been cured of HIV after receiving a stem cell transplant for leukaemia, researchers reported on Wednesday. While the transplant was planned to treat the now-66-year-old's leukaemia, the doctors also sought a donor who was naturally resistant to the virus that causes AIDS, a mechanism that first worked to cure the "Berlin patient," Timothy Ray Brown, in 2007.

The latest patient, the fourth to be cured in this way, is known as the "City of Hope" patient after the U.S. facility in Duarte, California, where he was treated, because he does not want to be identified. As well as being the oldest, the patient has also had HIV the longest, having been diagnosed in 1988 with what he described as a "death sentence" that killed many of his friends. He has been on antiretroviral therapy (ART) to control his condition for more than 30 years. [...] Scientists think the process works because the donor individual's stem cells have a specific, rare genetic mutation which means they lack the receptors used by HIV to infect cells. "Scientists think the process works because the donor individual's stem cells have a specific, rare genetic mutation which means they lack the receptors used by HIV to infect cells," adds Reuters.

"After the transplant three and a half years ago, which followed chemotherapy, the City of Hope patient stopped taking ART in March 2021. He has now been in remission from both HIV and leukaemia for more than a year, the team said."

Researchers in Spain also presented a case of a 59-year-old woman who is considered to be in a state of viral remission. "She has now maintained a fully suppressed viral load for over 15 years," reports NBC News. "Unlike the handful of people either cured or possibly cured by stem cell transplants, however, she still harbors virus that is capable of producing viable new copies of itself. Her body has actually controlled the virus more efficiently with the passing years, according to Dr. Juan Ambrosioni, an HIV physician in the Barcelona clinic."

An anonymous reader quotes a report from Phys.Org: Energy, mass, velocity. These three variables make up Einstein's iconic equation E=MC2. But how did Einstein know about these concepts in the first place? A precursor step to understanding physics is identifying relevant variables. Without the concept of energy, mass, and velocity, not even Einstein could discover relativity. But can such variables be discovered automatically? Doing so could greatly accelerate scientific discovery. This is the question that researchers at Columbia Engineering posed to a new AI program. The program was designed to observe physical phenomena through a video camera, then try to search for the minimal set of fundamental variables that fully describe the observed dynamics. The study was published on July 25 in Nature Computational Science.

The researchers began by feeding the system raw video footage of phenomena for which they already knew the answer. For example, they fed a video of a swinging double pendulum known to have exactly four "state variables" -- the angle and angular velocity of each of the two arms. After a few hours of analysis, the AI produced the answer: 4.7. The researchers then proceeded to visualize the actual variables that the program identified. Extracting the variables themselves was not easy, since the program cannot describe them in any intuitive way that would be understandable to humans. After some probing, it appeared that two of the variables the program chose loosely corresponded to the angles of the arms, but the other two remain a mystery. "We tried correlating the other variables with anything and everything we could think of: angular and linear velocities, kinetic and potential energy, and various combinations of known quantities," explained Boyuan Chen Ph.D., now an assistant professor at Duke University, who led the work. "But nothing seemed to match perfectly." The team was confident that the AI had found a valid set of four variables, since it was making good predictions, "but we don't yet understand the mathematical language it is speaking," he explained.

After validating a number of other physical systems with known solutions, the researchers fed videos of systems for which they did not know the explicit answer. The first videos featured an "air dancer" undulating in front of a local used car lot. After a few hours of analysis, the program returned eight variables. A video of a lava lamp also produced eight variables. They then fed a video clip of flames from a holiday fireplace loop, and the program returned 24 variables. A particularly interesting question was whether the set of variable was unique for every system, or whether a different set was produced each time the program was restarted. "I always wondered, if we ever met an intelligent alien race, would they have discovered the same physics laws as we have, or might they describe the universe in a different way?" said Hod Lipson, director of the Creative Machines Lab in the Department of Mechanical Engineering.

"Perhaps some phenomena seem enigmatically complex because we are trying to understand them using the wrong set of variables. In the experiments, the number of variables was the same each time the AI restarted, but the specific variables were different each time. So yes, there are alternative ways to describe the universe and it is quite possible that our choices aren't perfect."

Scientists have found more than 30 potentially new species living at the bottom of the sea. From a report: Researchers from the UK's Natural History Museum used a remotely operated vehicle to collect specimens from the abyssal plains of the Clarion-Clipperton Zone in the central Pacific. Previously, creatures from this area had been studied only from photographs. The study, published in the journal Zookeys, found there is a high species diversity of larger organisms in the abyss. Of the 55 specimens recovered, 48 were of different species. The animals found include segmented worms, invertebrates from the same family as centipedes, marine animals from the same family as jellyfish, and different types of coral. Thirty-six specimens were found at more than 4,800 metres deep, two were collected on a seamount slope at 4,125 metres, and 17 were found at between 3,095 and 3,562 metres deep.

Russia has announced that it will officially end its international collaboration with NASA around operation of the International Space Station (ISS) as of 2024, according to the AP. From a report: Roscosmos, the Russian space agency, also announced plans to construct its own orbital station, which build and operate independently of the U.S. The ISS was originally intended to be decommissioned sometime around 2024, but NASSA shifted its official retirement date to 2030. Roscosmos and NASA set an agreement earlier in July to still continue to exchange rides for American astronauts and Russian cosmonauts aboard each other's respective launch vehicles -- Russia's Soyuz and SpaceX's Crew Dragon -- on four upcoming missions to rotate the station's crew.

An anonymous reader quotes a report from the Washington Post: China's latest launch of a huge rocket is, once again, raising alarm that the debris will crash into the Earth's surface in an uncertain location and at great speed. On Sunday afternoon local time, the Long March 5B blasted off from the Wenchang launch site on the southern island province of Hainan, carrying a solar-powered new lab, the Wentian experiment module, to be added to China's Tiangong Space Station. But the size of the heavy-lift rocket -- it stands 53.6 meters (176 feet) tall and weighs 837,500 kilograms (more than 1.8 million pounds) -- and the risky design of its launch process have led experts to fear that some debris from its core stage could fail to burn up as it reenters Earth's atmosphere.

As with two previous launches, the rocket shed its empty 23-ton first stage in orbit, meaning that it will continue to loop the Earth over coming days as it gradually comes closer to landing. This flight path is difficult to predict because of fluctuations in the atmosphere caused by changes in solar activity. Although experts consider the chances of debris hitting an inhabited area very low, many also believe China is taking an unnecessary risk. After the core stage of the last launch fell into the Indian Ocean, NASA Administrator Bill Nelson said China was "failing to meet responsible standards regarding their space debris," including minimizing risks during reentry and being transparent about operations. China rejects accusations of irresponsibility. In response to concerns about last year's launch, the Chinese Foreign Ministry said the likelihood of damage was "extremely low."

Many scientists agree with China that the odds of debris causing serious damage are tiny. An article published in the journal Nature Astronomy this month put the chance that, under current launch practices, someone would die or be injured from parts of a rocket making an uncontrolled reentry at 1 in 10 over the next decade. But many believe launch designs like the Long March 5B's are an unnecessary risk. "Launch providers have access to technologies and mission designs today that could eliminate the need for most uncontrolled re-entries," the authors wrote. They proposed global safety standards mandating controlled reentry.
UPDATE: It crashed into the Indian Ocean.

A Mars orbiter has captured stunning pictures of the largest canyon in the solar system, called Valles Marineris. It stretches across 2,500 miles of the red planet's equator, a distance that is roughly equivalent to the diameter of the continental United States. Motherboard reports: Mars Express, a European Space Agency (ESA) mission that arrived at Mars in 2003, recently imaged the deepest reaches of this epic canyon, where its slopes descend more than four miles into the Martian surface, which is five times deeper than the Grand Canyon, according to an ESA statement. The observations reveal two massive "chasma," or trenches, that run parallel along the western portion of Valles Marineris, known as Tithonium Chasma in the south and Ius Chasma in the north. These trenches are each about 500 miles in length, making them twice as long as the Grand Canyon -- and they encompass only about a fifth of Valles Marineris' full extent.

Mars Express snapped these shots of the chasma in April with its High Resolution Stereo Camera, during its 23,123th orbit around the planet. The images are so sharp that ESA scientists used them to generate close-up perspectives of Tithonium Chasma that resemble aerial photographs. The pictures show dark dunes, huge mountains, and the fallout of landslides within the chasma, which are annotated in an accompanying map. Canyons on Earth are usually whittled out by the flow of rivers over millions of years, but scientists believe Valles Marineris was formed by tectonic activity on Mars more than three billion years ago. [...] Valles Marineris may have also hosted liquid water billions of years ago, when Mars was wetter, warmer, and potentially habitable.

Google, Microsoft, Meta and Amazon launched a public effort Monday to scrap the leap second, an occasional extra tick that keeps clocks in sync with the Earth's actual rotation. US and French timekeeping authorities concur. From a report: Since 1972, the world's timekeeping authorities have added a leap second 27 times to the global clock known as the International Atomic Time (TAI). Instead of 23:59:59 changing to 0:0:0 at midnight, an extra 23:59:60 is tucked in. That causes a lot of indigestion for computers, which rely on a network of precise timekeeping servers to schedule events and to record the exact sequence of activities like adding data to a database.

The temporal tweak causes more problems -- like internet outages -- than benefits, they say. And dealing with leap seconds ultimately is futile, the group argues, since the Earth's rotational speed hasn't actually changed much historically. "We are predicting that if we just stick to the TAI without leap second observation, we should be good for at least 2,000 years," research scientist Ahmad Byagowi of Facebook parent company Meta said via email. "Perhaps at that point we might need to consider a correction."

Microbes are the smallest known living organisms on Earth and can be found just about everywhere, even in the cold, Mars-like conditions of lava caves. From a report: On the island of Hawai'i, scientists recently found a marvelous assortment of novel microbes thriving in geothermal caves, lava tubes, and volcanic vents. These underground structures were formed 65 and 800 years ago and receive little to no sunlight. They can also harbor toxic minerals and gases. Yet microbial mats are a common feature of Hawai'ian lava caves. Samples of these mats, taken between 2006 and 2009 and then again between 2017 and 2019, reveal even more unique life forms than expected. When researchers sequenced 70 samples for a single RNA gene, commonly used for identifying microbial diversity and abundance, they could not match any results to known genuses or species, at least not with high confidence.

"This suggests that caves and fumaroles are under-explored diverse ecosystems," write the study's authors. e biomass in Earth's deep subsurface. Yet because these organisms are so tiny and live in such extreme environments, scientists have historically overlooked them. In recent years, underground microbes have received more interest because they exist in environments very similar to those found on Mars. But there's still a long way to go. Recent estimates suggest 99.999 percent of all microbe species remain unknown, leading some to refer to them as "dark matter." The new research from Hawai'i underscores just how obscure these life forms are.

CNET spoke to the systems and deputy program manager for the Hubble Space Telescope at Lockheed Martin, who remembers the first 1995 "deep field" image from the Hubble Space Telescope — taken over 10 days and revealing 3,000 galaxies. But he also remembers just how revolutionary it was. "To look at a 'dark' sliver of the sky and see so many stars and galaxies really drives home how much we still have to learn about the universe."

Looking back, that was only from 340 miles above our atmosphere — not the million miles from Earth travelled by the Webb Space Telescope (which also scours the universe "for cosmic bits emanating luminescence elusive to human eyes, otherwise known as infrared light.")

Yet while this has been a glorious month for astronomy, "We will absolutely still need Hubble," said Cornell University astronomer Nikole Lewis. "In fact, I'm in the process of trying to put together a budget for a large treasury program on Hubble." Lewis is after something Hubble has but JWST lacks. She studies exoplanets and intends to use visible and ultraviolet light wavelengths to decode clouds and hazes of foreign worlds — the type of light JWST isn't sensitive to. "There's a lot of important information at those wavelengths."

Despite JWST's clout, Hubble is also still the top candidate for scrutinizing galaxies moving along the X or Y axis, rather than the Z axis. "While galactic motion 'toward' and 'away' from Earth is very easy to measure with redshift," a JWST specialty, "'side to side' motion is harder," Caplan said.

In truth, this unique Hubble power turns out to be how we realized a pretty massive detail about galaxies. Many of them are on a crash course right now. By staring at Andromeda over the years — the galaxy that Hubble's namesake used as evidence in 1923 to prove our universe extends beyond the Milky Way — and measuring how its light on individual pixels transferred from one to the next, JWST's predecessor showed us that this galaxy isn't just orbiting ours. "They really will collide," Caplan explained. Would JWST have caught that?

Nonetheless, all of this is to say that as JWST continues to flood the internet with colorful depictions of space's outer reaches, we should remember that it isn't Hubble's replacement. JWST is its successor. It'll work in tandem with Hubble and wouldn't exist in a world without it.... And though the James Webb Space Telescope's story began with a bang, we ought not to let Hubble's end with a whimper. "They're not shutting Hubble down," said Dave Meyer, a Northwestern University professor focused on Hubble discoveries.

"We still think that's about a decade away."
And that systems and deputy program manager for the Hubble Space Telescope at Lockheed Martin also shared another part of its legacy: inspiring the next generation of astronomers. "I grew up being fascinated by the Shuttle program and was mesmerized watching the astronauts service Hubble.

"That was definitely part of my inspiration to become an aerospace engineer."

Reuters reports: The rapidly spreading monkeypox outbreak represents a global health emergency, the World Health Organization's highest level of alert, WHO Director-General Tedros Adhanom Ghebreyesus said on Saturday.

The WHO label — a "public health emergency of international concern" — is designed to trigger a coordinated international response and could unlock funding to collaborate on sharing vaccines and treatments. Members of an expert committee that met on Thursday to discuss the potential recommendation were split on the decision, with nine members against and six in favour of the declaration, prompting Tedros himself to break the deadlock, he told reporters. "Although I am declaring a public health emergency of international concern, for the moment this is an outbreak that is concentrated among men who have sex with men, especially those with multiple sexual partners," Tedros told a media briefing in Geneva.

A 37-year-old junior professor in Tennessee "identified apparently altered or duplicated images in dozens of journal articles," reports Science magazine.

But that was just the beginning for Matthew Schrag, whose sleuthing then "drew him into a different episode of possible misconduct, leading to findings that threaten one of the most cited Alzheimer's studies of this century and numerous related experiments." The first author of that influential study, published in Nature in 2006, was an ascending neuroscientist: Sylvain Lesné of the University of Minnesota, Twin Cities. His work underpins a key element of the dominant yet controversial amyloid hypothesis of Alzheimer's, which holds that A clumps, known as plaques, in brain tissue are a primary cause of the devastating illness, which afflicts tens of millions globally. In what looked like a smoking gun for the theory and a lead to possible therapies, Lesné and his colleagues discovered an A subtype and seemed to prove it caused dementia in rats.

If Schrag's doubts are correct, Lesné's findings were an elaborate mirage....

A 6-month investigation by Science provided strong support for Schrag's suspicions and raised questions about Lesné's research. A leading independent image analyst and several top Alzheimer's researchers — including George Perry of the University of Texas, San Antonio, and John Forsayeth of the University of California, San Francisco (UCSF) — reviewed most of Schrag's findings at Science's request. They concurred with his overall conclusions, which cast doubt on hundreds of images, including more than 70 in Lesné's papers. Some look like "shockingly blatant" examples of image tampering, says Donna Wilcock, an Alzheimer's expert at the University of Kentucky. The authors "appeared to have composed figures by piecing together parts of photos from different experiments," says Elisabeth Bik, a molecular biologist and well-known forensic image consultant. "The obtained experimental results might not have been the desired results, and that data might have been changed to ... better fit a hypothesis...."

Schrag's work, done independently of Vanderbilt and its medical center, implies millions of federal dollars may have been misspent on the research — and much more on related efforts. Some Alzheimer's experts now suspect Lesné's studies have misdirected Alzheimer's research for 16 years. "The immediate, obvious damage is wasted NIH funding and wasted thinking in the field because people are using these results as a starting point for their own experiments," says Stanford University neuroscientist Thomas Südhof, a Nobel laureate and expert on Alzheimer's and related conditions.

Lesné did not respond to requests for comment....

Some Alzheimer's experts see a failure of skepticism, including by journals that published the work.
Schrag has warned America's National Institutes of Health that the suspect work "not only represents a substantial investment in [NIH] research support, but has been cited ... thousands of times and thus has the potential to mislead an entire field of research."

And Harvard neurologic disease professor Dennis Selkoe told Science "There are certainly at least 12 or 15 images where I would agree that there is no other explanation" than manipulation. Selkoe's bigger worry, he says, is that the Lesné episode might further undercut public trust in science during a time of increasing skepticism and attacks. But scientists must show they can find and correct rare cases of apparent misconduct, he says. "We need to declare these examples and warn the world."
Thanks to Slashdot reader Crypto Fireside for sharing the story!

"In what's being hailed as an important first for chemistry, an international team of scientists has developed a new technology that can selectively rearrange atomic bonds within a single molecule," reports New Atlas. "The breakthrough allows for an unprecedented level of control over chemical bonds within these structures, and could open up some exciting possibilities in what's known as molecular machinery."

"Selective chemistry — the ability to steer reactions at will and to form exactly the chemical bonds you want and no others — is a long-standing quest in chemistry," adds the announcement from IBM Research. "Our team has been able to achieve this level of selectivity in tip-induced redox reactions using scanning probe microscopy." Our technique consisted in using the tip of a scanning probe microscope to apply voltage pulses to single molecules. We were able to target specific chemical bonds in those molecules, breaking those bonds and forging new, different ones to switch back and forth at will among three different molecular structures.

The molecules in our experiment all consisted of the same atoms, but differed in the way those atoms were bonded together and arranged in space... Our findings were published today and featured on the cover of Science.

Our demonstration of selective and reversible formation of intramolecular covalent bonds is unprecedented. It advances our understanding of chemical reactions and opens a route towards advanced artificial molecular machines.... Imagine one could rearrange bonds inside a molecule at will, transforming one structural isomer into various other ones in a controlled manner. In this paper, we describe a system and a method to make exactly that possible — including the control of the direction of the atomic rearrangements by means of an external driving voltage, and without the use of reagents.
Thanks to Slashdot reader Grokew for sharing the story!

This week America's Department of Defense "created an office to track unidentified objects in space and air, [and] under water," reports Space.com, "or even those that appear to travel between these domains." UFOs, or as they are now known, unidentified aerial phenomena (UAP) have been receiving newfound levels of government scrutiny not seen in decades. Multiple hearings and classified briefings have taken place in the halls of the U.S. Congress in recent months, and many lawmakers have expressed concern that America's airspace may not be as safe as we think due to the many sightings of unidentified objects military aviators and other armed forces personnel have reported.

With that in mind, the Department of Defense announced the creation of this new office in a statement published Wednesday (July 20). The office is known as the All-domain Anomaly Resolution Office, or AARO, and was established within the Office of the Under Secretary of Defense for Intelligence and Security... The office has six primary lines of effort: surveillance, collection and reporting; system capabilities and design; intelligence operations and analysis; mitigation and defeat; governance; and science and technology.
A statement from the U.S. Department of Defense spells out its mission:

• To synchronize efforts across the Department of Defense, and with other U.S. federal departments and agencies
• To detect, identify and attribute objects of interest in, on or near military installations, operating areas, training areas, special use airspace and other areas of interest
• As necessary, to mitigate any associated threats to safety of operations and national security.

Long-time Slashdot reader schwit1 notes the office already has its own Twitter feed, providing "updates and information relative to our examinations of unidentified anomalous phenomena across space, air, and maritime domains."

"A small space rock has proven to have a big effect on NASA's newly operational deep-space telescope," reports Space.com, causing "significant uncorrectable change" according to a new report from NASA engineers. But fortunately, "Seventeen mirror segments remain unblemished and engineers were able to realign Webb's segments to account for most of the damage." A micrometeoroid struck the James Webb Space Telescope between May 22 and 24, impacting one of the observatory's 18 hexagonal golden mirrors. NASA had disclosed the micrometeoroid strike in June and noted that the debris was more sizeable than pre-launch modeling had accounted for. Now, scientists on the mission have shared an image that drives home the severity of the blow in a report released July 12 describing what scientists on the mission learned about using the observatory during its first six months in space.

Happily, in this case the overall effect on Webb was small....

Based on fuel usage, the telescope should last 20 years in space. But scientists aren't sure how much of an effect micrometeroid strikes will have upon its operations, the report authors stated. Micrometeroids are a known danger of space operations, and facing them is by no means new to scientists; the International Space Station and the Hubble Space Telescope are among long-running programs that are still operational despite occasional space rock strikes. However, Webb's orbit at Lagrange Point 2 about 1 million miles (1.5 million kilometers) away from the Earth may change the risk profile considerably....

In this case, however, the overall impact to the mission is small "because only a small portion of the telescope area was affected...." Engineers are still modeling how frequently such events will occur....

One remedy could be minimizing the amount of time Webb points directly into its orbital direction, "which statistically has higher micrometeoroid rates and energies," the team wrote.
Thanks to Tablizer (Slashdot reader #95,088) for sharing the article!

An anonymous reader quotes a report from Phys.Org: By shining a laser pulse sequence inspired by the Fibonacci numbers at atoms inside a quantum computer, physicists have created a remarkable, never-before-seen phase of matter. The phase has the benefits of two time dimensions despite there still being only one singular flow of time, the physicists report July 20 in Nature. This mind-bending property offers a sought-after benefit: Information stored in the phase is far more protected against errors than with alternative setups currently used in quantum computers. As a result, the information can exist without getting garbled for much longer, an important milestone for making quantum computing viable, says study lead author Philipp Dumitrescu.

The approach's use of an "extra" time dimension "is a completely different way of thinking about phases of matter," says Dumitrescu, who worked on the project as a research fellow at the Flatiron Institute's Center for Computational Quantum Physics in New York City. "I've been working on these theory ideas for over five years, and seeing them come actually to be realized in experiments is exciting." Dumitrescu spearheaded the study's theoretical component with Andrew Potter of the University of British Columbia in Vancouver, Romain Vasseur of the University of Massachusetts, Amherst, and Ajesh Kumar of the University of Texas at Austin. The experiments were carried out on a quantum computer at Quantinuum in Broomfield, Colorado, by a team led by Brian Neyenhuis.

SpaceX made it through its second attempt to launch 46 satellites on Friday (July 22), breaking a record along the way. The launch allowed SpaceX to surpass its 31 record launches of 2021 with a 32nd record launch in 2022, and still counting. Space.com reports: The two-stage Falcon 9 rocket, which induced a scrub at T-46 seconds on Thursday (July 21), lifted off successfully from Vandenberg Space Force Base in California Friday. Liftoff took place at 1:40 p.m. EDT (1740 GMT or 10:40 a.m. local time at the launch site) amid severely foggy conditions on the west coast. Falcon 9's first stage also completed its mission, landing atop the "Of Course I Still Love You" droneship in the Pacific Ocean as planned, about 8.5 minutes after launch. The report notes that SpaceX has launched more than 2,800 individual Starlink satellites to orbit as the company seeks to build out its satellite-internet service.

A 2021 eruption in Iceland gave researchers rare and illuminating access to the mantle, one of the Earth's layers. From a report: What do you do when a volcano erupts for the first time in centuries? For many people on the southern peninsula in Iceland, when the Fagradalsfjall volcano went off in 2021 after 781 years of dormancy, the answer was to take pictures. As the eruption continued over the course of six months, tourists and locals traveled closer to the volcano to take even more. Red bursts flying out of a black pyramid; the viscous creep of flame. But this documentation only went so far. Some scientists wanted to know what was going on underneath the surface, miles deep, where light does not reach. There, the flowing rock works in ways that experts still cannot describe. So on the first day of the eruption, a helicopter flew out to the site and scooped up a bit of lava. Some samples were distributed to labs, which, after testing, sent back unexpected results: The lava was full of crystals.

Recently, with the help of similar samples gathered throughout the Fagradalsfjall eruption, steps have been taken toward characterizing the dynamics under the surface of the oceanic volcano. In a paper published in June in the journal Nature Communications, researchers who observed the chemical composition of the lava crystal samples collected over a six-month period found that they contained a wide range of material from different parts of the mantle, the amalgamate layer between the Earth's crust and core. This kind of variation was unexpected, and it painted a more vivid picture of what contributes to volcanic eruptions. "We have a really detailed record of the different types of composition that we can find in the mantle now, and it must be very heterogeneous, very variable," said Frances Deegan, a volcanologist at Uppsala University in Sweden, and a co-author of the paper. Compositionally, the Fagradalsfjall lava was primitive, meaning it came from a deep reservoir of magma, or underground lava, not a shallow reservoir in the Earth's crust. Noticing this, researchers, including Ed Marshall, a geochemist at the University of Iceland, sprinted to gather more samples as the lava continued to spew out of vents. "We were working all hours -- you're asleep and the volcano's still erupting and you're like, 'I got to get back out there,'" said Dr. Marshall. "But it's hard to describe how rare this kind of thing is."

Fagradalsfjall exists at a confluence of fault lines along a boundary between the Eurasian and North American tectonic plates, a point where they are both pulling apart and rubbing against each other. Geological records show that there has been periodic volcanic activity in the region about every thousand years, and this most recent fissure was preceded by more than a year of earthquakes. Olafur Flovenz, director of the Iceland GeoSurvey, recently published a paper with colleagues that suggests this activity was not caused by a body of magma accumulating in the crust, but from carbon dioxide released by deeper magma pooling between the mantle and the crust, in a region called the Mohorovicic discontinuity, or moho. Usually, volcanic eruptions occur when lots of small magma flows mix together. "This mixing process is an essential geologic process, but it's never been directly observed," said Dr. Marshall. It occurs so deep under the surface and many of the chemical signatures of individual flows are lost as the magma moves up through the crust. But when Fagradalsfjall erupted in 2021, the molten rock and crystals that shot up to the surface came directly from the moho.

sciencehabit shares a report from Science Magazine: The Moon isn't necessarily there if you don't look at it. So says quantum mechanics, which states that what exists depends on what you measure. Proving reality like that usually involves the comparison of arcane probabilities, but physicists in China have made the point in a clearer way. They performed a matching game [Mermin-Peres game] in which two players leverage quantum effects to win every time -- which they can't if measurements merely reveal reality as it already exists. [...] In each round of the game, Alice and Bob share not one, but two pairs of entangled photons on which to make any measurements they like. Each player also has a three-by-three grid and fills each square in it with a 1 or a -1 depending on the result of those measurements. In each round, a referee randomly selects one of Alice's rows and one of Bob's columns, which overlap in one square. If Alice and Bob have the same number in that square, they win the round.

Sounds easy: Alice and Bob put 1 in every square to guarantee a win. Not so fast. Additional "parity" rules require that all the entries across Alice's row must multiply to 1 and those down Bob's column must multiply to -1. If hidden variables predetermine the results of the measurements, Alice and Bob can't win every round. Each possible set of values for the hidden variables effectively specifies a grid already filled out with -1s and 1s. The results of the actual measurements just tell Alice which one to pick. The same goes for Bob. But, as is easily shown with pencil and paper, no single grid can satisfy both Alice's and Bob's parity rules. So, their grids must disagree in at least one square, and on average, they can win at most eight out of nine rounds.

Quantum mechanics lets them win every time. To do that, they must use a set of measurements devised in 1990 by David Mermin, a theorist at Cornell University, and Asher Peres, a onetime theorist at the Israel Institute of Technology. Alice makes the measurements associated with the squares in the row specified by the referee, and Bob, those for the squares in the specified column. Entanglement guarantees they agree on the number in the key square and that their measurements also obey the parity rules. The whole scheme works because the values emerge only as the measurements are made. The rest of the grid is irrelevant, as values don't exist for measurements that Alice and Bob never make. Generating two pairs of entangled photons simultaneously is impractical, Xi-Lin Wang says. So instead, the experimenters used a single pair of photons that are entangled two ways -- through polarization and so-called orbital angular momentum, which determines whether a wavelike photon corkscrews to the right or to the left. The experiment isn't perfect, but Alice and Bob won 93.84% of 1,075,930 rounds, exceeding the 88.89% maximum with hidden variables, the team reports in a study in press at Physical Review Letters. The researchers have a real-world use in mind for the demonstration: verifying the work of a quantum computer.

"That task is essential but difficult because a quantum computer is supposed to do things an ordinary computer cannot," reports Science Magazine. "[I]f the game were woven into a program, monitoring it could confirm that the quantum computer is manipulating entangled states as it should."

An unvaccinated young adult from New York recently contracted polio, the first U.S. case in nearly a decade, health officials said Thursday. The Associated Press reports: Officials said the patient, who lives in Rockland County, had developed paralysis. The person developed symptoms a month ago and did not recently travel outside the country, county health officials said. It appears the patient had a vaccine-derived strain of the virus, perhaps from someone who got live vaccine -- available in other countries, but not the U.S. -- and spread it, officials said. The person is no longer deemed contagious, but investigators are trying to figure out how the infection occurred and whether other people may have been exposed to the virus. The report notes that polio was declared eliminated in the U.S. in 1979, "meaning there was no longer routine spread."