Science & Environment
Bizarre crystal made only of electrons revealed in astonishing detail
It is hard to coax electrons to form a crystal, and even harder to measure this structure. But physicists have now managed to directly image a “Wigner crystal” – and their images are the clearest ones yet.
“There have been many, literally hundreds, of papers written on finding evidence for the Wigner crystal sort of indirectly,” says Ali Yazdani at Princeton University. “And we never thought that we would succeed in [directly] imaging it. It was a bit of an accident.”
At room temperature, electrons can flow together in electric currents because their kinetic energy overcomes the force that makes particles with the same electric charge repel each other. At very low temperatures, however, repulsive electric forces win out, and the electrons end up arranging themselves into a uniform grid, or a crystal. Physicist Eugene Wigner predicted this phenomenon in 1934, but researchers only recently started to understand how to create Wigner crystals in the lab.
Yazdani and his colleagues made their Wigner crystal from electrons inside of two thin sheets of graphene, each only one atom thick. To diminish the electrons’ kinetic energy, they put the graphene inside a fridge that cooled it to only a few hundredths of a degree above absolute zero and immersed it in a strong magnetic field.
Yazdani says that it was crucial that their graphene had very few imperfections where electrons could get stuck. Otherwise, the particles could form a crystal-like state because of the structure of those imperfections, rather than because of the interactions with each other, as Wigner predicted.
In past experiments, researchers would look for evidence of a Wigner crystal by trying to nudge electrons into forming currents: once the particles failed to flow, researchers could infer that the electrons were locked into a grid. But Yazdani’s team directly imaged its crystal with a special microscope.
This microscope used a quantum effect called tunnelling. It scanned an extremely sharp metallic tip across the surface of the graphene, and when it passed over an electron, the particle would tunnel through the gap between the surface and the tip, creating a small electric current. Because of these currents, the researchers knew where and how densely the electrons were positioned inside the graphene, letting them create the most precise images of a Wigner crystal yet.
One other experiment used this method previously, but in that case, the grid of electrons was inside of a material that was itself sandwiched between layers of other materials. This made the imaging less direct, and it made it harder to determine why the electrons formed a crystal – they could have been influenced by the grid-like structure of the nearby materials.
In their images, Yazdani and his colleagues saw electrons sitting at vertices of repeating triangles, just as Wigner predicted. Additionally, they tracked how the crystal’s structure changed as they shifted factors such as temperature, the strength of the magnetic field and how many electrons it contained, which they could do by applying an electric voltage to the material. Under these changing conditions, the crystal “melted” into an exotic, incompressible electron fluid, as well as a fluid where electrons formed stripes.
These melted states are what the team wants to image next. Some of them are full of particle-like excitations, which are like electrons but only carry a fraction of their charge. Yazdani hopes he and his collaborators could image the excitations’ crystallisation too.
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Science & Environment
SpaceX to launch bitcoin entrepreneur and three crewmates on flight around Earth’s poles
A blockchain entrepreneur, a cinematographer, a polar adventurer and a robotics researcher plan to fly around Earth’s poles aboard a SpaceX Crew Dragon capsule by the end of the year, becoming the first humans to observe the ice caps and extreme polar environments from orbit, SpaceX announced Monday.
The historic flight, launched from the Kennedy Space Center in Florida, will be commanded by Chun Wang, a wealthy bitcoin pioneer who founded f2pool and stakefish, “which are among the largest Bitcoin mining pools and Ethereum staking providers,” the crew’s website says.
“Wang aims to use the mission to highlight the crew’s explorational spirit, bring a sense of wonder and curiosity to the larger public and highlight how technology can help push the boundaries of exploration of Earth and through the mission’s research,” SpaceX said on its website.
Wang’s crewmates are Norwegian cinematographer Jannicke Mikkelsen, Australian adventurer Eric Philips and Rabea Rogge, a German robotics researcher. All four have an interest in extreme polar environments and plan to carry out related research and photography from orbit.
The mission, known as “Fram2” in honor of a Norwegian ship used to explore both the Arctic and Antarctic regions, will last three to five days and fly at altitudes between about 265 and 280 miles.
“This looks like a cool & well thought out mission. I wish the @framonauts the best on this epic exploration adventure!” tweeted Jared Isaacman, the billionaire philanthropist who charted the first private SpaceX mission — Inspiration4 — and who plans to blast off on a second flight — Polaris Dawn — later this month.
The flights “showcase what commercial missions can achieve thanks to @SpaceX’s reusability and NASA’s vision with the commercial crew program,” Isaacman said. “All just small steps towards unlocking the last great frontier.”
Like the Inspiration4 mission before them, Wang and his crewmates will fly in a Crew Dragon equipped with a transparent cupola giving them a picture-window view of Earth below and deep space beyond.
No astronauts or cosmonauts have ever viewed Earth from the vantage point of a polar orbit, one tilted, or inclined, 90 degrees to the equator. Such orbits are favored by spy satellites, weather stations and commercial photo-reconnaissance satellites because they fly over the entire planet as it rotates beneath them.
The high-inclination record for piloted flight was set in the early 1960s by Soviet Vostok spacecraft launched into orbits inclined 65 degrees. The U.S. record was set by a space shuttle mission launched in 1990 that carried out a classified military mission in an orbit tilted 62 degrees with respect to the equator.
The International Space Station never flies beyond 51.6 degrees north and south latitude. NASA planned to launch a space shuttle on a classified military mission around the poles in 1986, but the flight was canceled in the wake of the Challenger disaster.
“The North and South Poles are invisible to astronauts on the International Space Station, as well as to all previous human spaceflight missions except for the Apollo lunar missions but only from far away,” the Fram2 website says. “This new flight trajectory will unlock new possibilities for human spaceflight.”
SpaceX has launched 13 piloted missions carrying 50 astronauts, cosmonauts and private citizens to orbit in nine NASA flights to the space station, three commercial visits to the lab and the Inspiration4 mission chartered by Isaacman.
Isaacman and three crewmates plan to blast off Aug. 26 on another fully commercial flight, this one featuring the first civilian spacewalks. NASA plans to launch its next Crew Dragon flight to the space station around Sept. 24.
Science & Environment
Giant “flying” Joro spiders love big cities. A new study found their ability to chill out in stressful situations may be why
The saga of the large invasive Joro spiders that parachute through the air isn’t over. A new study found that the critters with 4-inch-long legs are truly built differently, with hearts that are able to withstand the loud and bustling noises of big cities.
University of Georgia researcher Andy Davis made the discovery while conducting cardiac stress tests on Joro spiders and their cousin, the golden silk spider. The research, published in Physiological Entomology on Monday, found that the species know how to chill out and stay calm when put in heart rate-raising situations.
The Joro spider, also known as Trichonephila clavata, “is known for making webs not only in natural green spaces but also in cities and towns, often on buildings and human dwellings,” the study says. “The stress reactions of Trichonephila spiders could be characterized as ‘even-tempered,’ which may factor into their ability to live in habitats with frequent disturbances.”
Davis and his team evaluated the physiological reactions of Joro spiders and golden silk spiders and compared them to those of another pair of similarly-sized species that are related to each other, garden spiders and banded garden spiders.
Researchers recorded baseline heart rates of the arachnids while they were resting and inactive, and then recorded their heart rates after restraining them under electronic sensors for 10 minutes.
“When subjected to the novel restraint stress, heart rates of all spider species became elevated, which is an expected reaction that other spider researchers have noted,” the study says. “However, there were differences among species in the magnitude of this elevation, and of how the responses progressed during the 10 min period.”
The garden spiders, both of which belong to the Argiope genus, showed “distinct periods of fluctuations during the restraint” and were even found to struggle against the restraints, researchers said. Joro spiders and their golden silk cousins, on the other hand, were “less variable and more even.” They were also observed entering a state of thanatosis for more than an hour after stressors, meaning they essentially froze up during that time.
The tests “are beginning to paint a picture of how the invasive Joro spider and its cousin, the golden silk spider, have a unique way of tolerating novel stressors, which may be the reason for their ability to occupy anthropogenic landscapes,” researchers said, noting that other spider species in their family line could share this trait, although that would need further investigation.
Joro spiders have been making headlines for years as they continue to spread up the East Coast. Originally from Asia, the spiders are believed to have been first introduced to north Georgia around 2010. They have since been found across nearly a dozen other states. In December, Davis told The New York Times that New York is “right in the middle of where they like to be.” It’s been predicted that they could pop up in the New York tri-state area this summer, although no reports of such have been made.
“They seem to be OK with living in a city,” he told the paper, adding that they’ve been seen hanging out on street lamps and telephone poles, where “regular spiders wouldn’t be caught dead in.”
The latest findings may not definitively prove that the spiders’ relaxed demeanor is the reason for “their affinity for urban settings,” the study says, adding that more research is needed. It does, however, bolster Davis’ research from February, which also found that Joro spiders don’t necessarily mind the increased noise and vibrations that come with city living.
“These Joro webs are everywhere in the fall, including right next to busy roads, and the spiders seem to be able to make a living there. For some reason, these spiders seem urban tolerant,” Davis said of his earlier research.
UGA student and co-author of that study, Alexa Schultz, agreed, saying, “It looks like Joro spiders are not going to shy away from building a web under a stoplight or an area where you wouldn’t imagine a spider to be.”
But don’t worry — while the spiders are venomous, they don’t pose a danger to humans, although they may elevate your heart rate more than you elevate theirs.
Science & Environment
New volcanic eruption in Iceland brings video of lava spewing from miles-long fissure on Reykjanes peninsula
Reykjavik — Icelandic authorities said Friday that a second fissure had formed on the southwestern Reykjanes peninsula after lava started spewing forth for the sixth time in the region since December. After weeks of warnings, the Icelandic Meteorological Office (IMO) said Thursday that a new eruption had started at 9:26 p.m. (5:26 p.m. Eastern) that evening, following a series of earthquakes.
Video showed orange lava bursting out of a long fissure, which the IMO estimated to be 2.4 miles.
Early Friday, the IMO announced on social media that a second fissure had opened up to the north of the original one, but it said the volcanic activity mostly remained on the first crack.
The weather agency, which also monitors geological events, had previously reported that there was “considerable seismic activity” at the northern end of the fissure.
About an hour after the eruption started an earthquake with a magnitude of 4.1 was recorded in the area.
This is the sixth eruption to hit the area since December, coming just two months after the end of a previous eruption that lasted more than three weeks.
The chief of police of the Sudurnes region, Ulfar Ludviksson, told Icelandic media that the evacuation of the nearby fishing village of Grindavik had gone well.
He added that 22 or 23 houses in the village were currently occupied. Most of Grindavik’s 4,000 residents had evacuated in November, prior to a December eruption, and while residents have since been allowed to return in between eruptions, only a few have opted to stay overnight.
According to the IMO, there was no lava flowing towards Grindavik in the latest eruption.
Iceland’s famed Blue Lagoon thermal spa tourist attraction said late Thursday that it had taken “the precautionary measure of evacuating and temporarily closing all our operational units.”
The Reykjanes peninsula had not experienced an eruption for eight centuries until March 2021. Further eruptions occurred in August 2022 and in July and December 2023, leading volcanologists to warn that a new era of seismic activity had begun in the region.
Iceland is home to 33 active volcano systems, the highest number in Europe. It straddles the Mid-Atlantic Ridge, a crack in the ocean floor separating the Eurasian and North American tectonic plates.
Science & Environment
Matching dinosaur footprints found more than 3,700 miles apart, on different continents
A team of paleontologists found matching dinosaur footprints on what are now two different continents, separated by thousands of miles of ocean.
The footprints, dating back to the Early Cretaceous period, were found in Brazil and in Cameroon, researchers wrote in a study published Monday by the New Mexico Museum of Natural History & Science. The discovery shows where land-dwelling dinosaurs were able to cross freely between South America and Africa before the two continents split apart millions of years ago.
Land shifts
The more than 260 footprints researchers studied were found impressed into mud and silt along ancient rivers and lakes, with more than 3,700 miles separating the ones in South America and Africa, according to the study. Paleontologists determined they were similar in age, shape and in geological and plate tectonic contexts.
Dinosaurs made the tracks 120 million years ago on a single supercontinent known as Gondwana, which had broken off from the larger landmass of Pangea — once the world’s only continent, Southern Methodist University paleontologist Louis Jacobs said.
“One of the youngest and narrowest geological connections between Africa and South America was the elbow of northeastern Brazil nestled against what is now the coast of Cameroon along the Gulf of Guinea,” Jacobs, the lead study author, said. “The two continents were continuous along that narrow stretch, so that animals on either side of that connection could potentially move across it.”
The continents now known as Africa and South America started to split around 140 million years ago, researchers said. The south Atlantic Ocean eventually filled the void.
Basins formed as the continents pulled apart; rivers flowed and lakes formed in those basins, Jacobs said. The basins where the footprints were discovered can be found on both sides of the split.
What we know about the dinosaurs
Most of the footprints were made by three-toed theropods, a group of carnivorous dinosaurs, researchers said. There were also prints left behind by sauropods or ornithischians.
“Plants fed the herbivores and supported a food chain,” Jacobs said. “Muddy sediments left by the rivers and lakes contain dinosaur footprints, including those of meat-eaters, documenting that these river valleys could provide specific avenues for life to travel across the continents 120 million years ago.”
Science & Environment
SpaceX launches 21 Starlink satellites, but rocket’s first stage crashes on landing barge
After standing down from the piloted Polaris Dawn launch late Tuesday, SpaceX shifted gears and pressed ahead with plans for back-to-back launches of Starlink internet satellites early Wednesday, one from Florida and the other from California.
But the second flight was called off after the first stage used in the Florida launch toppled into the Atlantic Ocean and broke apart while attempting to land on a SpaceX droneship stationed several hundred miles northeast of Cape Canaveral. The landing mishap ended a string of 267 successful booster recoveries dating back to February 2021.
The Falcon 9’s second stage, meanwhile, successfully carried 21 Starlink satellites to their planned orbit.
The first stage landing appeared normal until the moment of touchdown when more flames than usual were visible around the base of the rocket as it neared the deck. A landing leg immediately collapsed on touchdown and the booster, obscured by fire and smoke, tipped over the side of the landing barge into the Atlantic.
“After a successful ascent, Falcon 9’s first stage booster tipped over following touchdown on the A Shortfall of Gravitas droneship,” SpaceX said on the social media site X. “Teams are assessing the booster’s flight data and status.”
It was first stage B1062’s 23rd and what turned out to be final launch and landing, a new reuse record. SpaceX is working toward certifying its Falcon 9 first stages for up to 40 flights each.
Shortly after the Starlinks launched from Florida were deployed, SpaxeX called off the California launch, planned for 5:58 a.m. EDT, to give engineers more time to review telemetry and video footage, on the lookout for any signs of trouble that could affect other rockets.
“Standing down from our second @Starlink launch of the night to give the team time to review booster landing data from the previous launch,” SpaceX said on X. “A new target launch date will be shared once available.”
Here are updated Falcon 9 stats through through this morning’s Florida launch:
Total Falcon 9 launches to date: 367
Total Falcon Heavy launches to date: 10
Total Super Heavy/Starship launches to date: 4
Falcon 9/Heavy launches this year: 83 (82 F9s, 1 FH)
In-flight Falcon 9/Heavy failures: 2 (06/28/15, 07/11/24)
Successful Falcon 9/Heavy launches in a row: 13
Most successful flights in a row: 344 (between 6/28/15 and 07/11/24)
Starlink launches to date: 190 (181 dedicated flights, 9 mixed payloads)
Starlink launches this year: 58
Starlink satellites launched to date: 6,920
Starlinks with direct-to-cell capability: 136
Starlinks presumed to be working going into latest launch: 6,269*
Payloads launched to orbit this year by SpaceX: 1,548
First stage fleet leader: B1062, 23 flights (booster lost on landing)
California landings to date: 20
Florida landings to date: 54
Droneship landings to date: 267 (not counting today’s flight)
Successful booster landings overall: 341
Successful booster landings in a row: 267 (before today’s flight)
*Source: https://planet4589.org/space/con/star/stats.html
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