Science
Grand Canyons on the Moon Were Made in a Matter of Minutes
Two canyons near the south pole of the moon rival the Grand Canyon, both in depth and length.
Unlike the sinuous chasm in Arizona, the two lunar canyons, known as Vallis Schrödinger and Vallis Planck, are straight, as if the crust of the moon had been cut by a knife.
And unlike the Grand Canyon, carved over millions of years by the flow of the Colorado River, Vallis Schrödinger and Vallis Planck formed in just minutes after a 15-mile-wide meteor struck the moon some 3.8 billion years ago.
Indeed, carving these vast lunar trenches took less time than it might take you to bake a frozen pizza.
The impact, comparable to the one that smashed into the Earth 66 million years ago and killed the dinosaurs, punched up to 15 miles into the crust and excavated a crater about 200 miles wide. In the process, it ejected fusillades of giant rocks — what planetary scientists call ejecta rays — that crashed down in staccato succession to create the canyons, which are more than 1.5 miles deep and more than 165 miles long.
“They truly are extraordinary in scale,” said David Kring, a scientist at the Lunar and Planetary Institute in Houston. “These things were carved in less than 10 minutes when the Grand Canyon took 5 to 6 million years to carve. I mean that illustrates the energy of an impact event.”
In a new analysis, Dr. Kring and his colleagues, Danielle Kallenborn and Gareth Collins of Imperial College London, constructed a mathematical model to describe how the canyons formed in a rain of giant rocks. They used photographs taken by NASA’s Lunar Reconnaissance Orbiter, which showed a string of craters along the canyons, to calculate the speed and direction of the debris.
“Imagine a kilometer- or a five-kilometer rock hitting the ground at over 2,000 miles per hour,” Dr. Kring said. “Each one of these blocks will produce a crater about 20 kilometers in diameter. And they hit the ground — bang, bang, bang, bang, bang.”
The scientists calculated that the energy needed to create the two canyons was more than 130 times what would be produced in an explosion of all the nuclear weapons that exist on Earth today.
Their findings appear in a paper published on Tuesday in the journal Nature Communications.
The canyons also suggest that the incoming asteroid or comet hit at an angle even though the crater itself is almost circular in shape.
The straight lines of Vallis Schrödinger and Vallis Planck radiate outward from the Schrödinger basin crater. But the scientists noticed that the lines, if extended, did not intersect at the center of the crater.
Instead, the intersection point is to the south. That is likely where the space rock hit, the scientists said.
“I think they’ve got the interpretation right on that,” said Jennifer Anderson, a professor of geoscience at Winona State University in Minnesota. “These ginormous crater rays, they point back to a point that is up range of the center of the crater.”
That indicates that the meteor came from the south and that the curtain of debris was largely kicked to the north, away from the south pole.
That is an encouraging finding for Artemis, NASA’s return-to-the-moon program, because it suggests that the areas near the south pole where the agency wants to land astronauts are not covered by debris from the Schrödinger impact and that rocks from a much larger, much older impact known as the South Pole–Aitken basin would be exposed at the surface.
Dr. Anderson said the new findings matched with small-scale laboratory experiments she had conducted a couple of decades ago, firing BB-size pellets into sand, which created craters less than a foot in diameter.
“It’s the farthest ejecta on the surface that tell you about what happened at earliest times in the cratering event,” she said.
What is less certain is how the impact produced a long, narrow stream of rocks in the ejecta rays instead of a more uniform cascade in all directions.
“We still debate the origin,” Dr. Kring said.
The ejecta rays might have resulted from earlier craters or other unevenness of the terrain. “It could have been two preexisting craters caused the focusing of some of this debris into these rays,” Dr. Kring said.
Dr. Anderson said such rays also occurred in her small-scale experiments, and she, too, could not explain that phenomenon.
“We can see that there are areas of the ejecta curtain that are more dense with material as opposed to less dense,” she said. “Why that is, I don’t know that anyone knows yet, except that nature is messy.”
Science
China Launches Reusable Rocket in Race With SpaceX
Video released by Chinese state media shows a state-owned aerospace company launching a rocket and recovering part of it on Friday. The successful launch of a reusable rocket was a major step for China toward challenging SpaceX’s satellite internet dominance.
Science
Nobel Prize winner leaving UC Berkeley for new role in China
Nobel Prize recipient Omar Yaghi is leaving his role at UC Berkeley to lead the development of a new artificial intelligence institute at Tsinghua University in Beijing, the Chinese university announced.
Yaghi will head the AI Chemistry and Materials Research Institute at Tsinghua, where he was appointed an honorary professor in 2022. Known as AIMATRY (AI × Materials × Chemistry), the new center will focus on material design and synthesis through artificial intelligence, according to a statement from the university.
In 2025, Yaghi shared the Nobel Prize in chemistry with Susumu Kitagawa of Kyoto University and Richard Robson of the University of Melbourne for their development of metal-organic frameworks, a type of super-porous material in which metal ions and carbon-based molecules combine to form crystals with exceptionally large surface areas.
The material has the potential to combat climate change by capturing and storing carbon or other pollutants, and by extracting water from the atmosphere in water-scarce areas. Upon awarding the prize, a member of the Nobel committee likened the technology’s ability to store enormous amounts of stuff in seemingly compact spaces to Hermione Granger’s enchanted handbag in the Harry Potter series.
Yaghi’s Irvine-based company, Atoco, has said it will start taking orders later this year for its technology that harvests water from the air.
A representative for Yaghi said he was not yet available to respond to questions.
China is one of several countries that has been actively recruiting scientists from the U.S., where the Trump administration has slashed science funding, suspended research grants, fired science advisors and tightened immigration restrictions.
“For many, many years, our funding was very competitive; if you worked hard and you were doing good research, you would get funding,” Yaghi said of the U.S. in an interview with Scientific American earlier this year. “The current state is not so encouraging because of the cutting back on grants and support of science by the very agencies that many university researchers rely on.”
Yaghi was born in Jordan to Palestinian refugees, and immigrated to the U.S. when he was 15 to study.
“We’ve learned over and over in human civilization that scholars can move across borders,” Yaghi told the New York Times last year. “This is how knowledge spread and how vast regions of the world lifted themselves out of poverty.”
Science
Trump administration seeks to limit federal funding that doesn’t ‘advance’ presidential policies
A new rule proposed by the White House Office of Management and Budget would fundamentally overhaul the way federal grants are awarded and overseen — a sweeping change that one scientific society said “would all but end the use of scientific merit in the selection of grants and programs across the government.”
Proposed in late May, the rule would give political appointees unprecedented control over federal grants for research, education and infrastructure, and specifies that government funds can only be spent on projects “aligned with administration policies and priorities,” according to a copy of the proposed rule.
The rule would also restrict research topics, limit U.S. scientists’ ability to collaborate with colleagues in other countries and make it easier for the government to suspend or cancel grants at any time.
The changes are intended to improve “transparency, accountability, and oversight for Federal awards” while “ensuring that American tax dollars are not wasted or misused,” according to the White House office.
But critics say that if the rule is implemented, the final sign-off for grants will no longer be in the hands of subject-matter experts within individual agencies, but in those of political appointees.
“This touches all parts of American life,” said Dr. Eric Rafla-Yuan, a psychiatrist who practices at the Veterans Administration and San Diego County’s psychiatric hospital.
“Control of how all of the federal grants and programs are funded will fall under a small group of highly partisan individuals who would have very few limits on how they spend these billions of taxpayer dollars,” said Rafla-Yuan, who also chairs the Committee to Protect Public Mental Health advocacy group. “This touches everyone’s life, even if they don’t realize it.”
OMB published the proposed rule May 29, opening a 45-day comment period that closes July 13.
Opposition to the proposed rule has mobilized multiple sectors of society. Professional groups representing cancer researchers, civil engineers, county governments, medical schools, housing agencies, city and municipal governments, nonprofits and others have publicly expressed concerns about potential consequences.
By midday Thursday, the Federal Register logged nearly 100,000 comments about the proposal, many of them expressing concern.
“I understand the need for oversight, fiscal responsibility, and accountability. That is not the issue,” wrote Jack Feldman, a neuroscientist who holds the David Geffen School of Medicine Chair in Neuroscience at UCLA. “The issue is whether scientific research is to be judged by scientific merit, or whether it can be approved, denied, or terminated according to broad political criteria that may change from one administration to the next.”
Crucially, the rule converts policies governing federal grants from “guidance” into binding regulations that all agencies would be required to follow. It would give political appointees power to override federal agencies’ merit-based reviews and mandate that a political appointee review decisions to ensure that all awards “demonstrably advance the President’s policy priorities.”
The elevation of political appointees in what were previously merit-based decisions has alarmed many scientists.
“The proposed rule changes would all but end the use of scientific merit in the selection of grants and programs across the government,” read a statement from the Planetary Society, a nonprofit dedicated to space research.
Researchers and science groups have also expressed concern about a section of the rule prohibiting the promotion of “theories of disparate-impact liability” — a legal concept that refers to policies that appear neutral but cause disproportionate harm to certain groups.
The section’s vague language and many loopholes could have a chilling effect on any research that studies the effects of a disease, policy or public health intervention on any specific group of people, Rafla-Yuan said.
As an example, he said, “if there’s a specific age range that is at higher risk for suicide, and we want to figure out, well, what’s going on with people that are aged 14 to 19 … we can’t do that under the wording in this rule.”
New restrictions on collaborations with scientists in other countries would hinder opportunities for U.S. researchers and limit innovation, said Joanne Padrón Carney, chief government relations officer for the American Assn. for the Advancement of Science.
“Science is a global enterprise. Especially in biomedical and public health fields, diseases don’t care about borders or government policies,” she said.
California’s congressional delegation sent a letter Wednesday asking OMB to rescind the proposal, outlining concerns about its impact on scientific innovation, U.S. competitiveness and the fiscal stability of local governments, many of which rely on federal grants for local services.
The proposed rule grants the federal government broad powers to suspend or cancel grants for any reason, introducing “unprecedented unpredictability into local governance,” the lawmakers wrote, “leaving vital infrastructure projects unfinished and abandoning vulnerable populations who rely on these services.”
Republican Sen. Susan Collins has also asked the White House to withdraw certain parts of the letter and extend the public comment period, saying the proposed rule as written would “harm small and rural communities, undermine scientific and biomedical research, and conflict with Congress’ control over the federal funding process.”
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