NASA Rover Finds ‘Potential Biosignature’ on Mars
Welcome back to the Abstract! These are the studies this week that broke ice, broke hearts, and broke out the libations. Also, if you haven’t seen it already, we just covered an amazing breakthrough in our understanding of the cosmos, which is as much a story about humanity’s endless capacity for ingenuity as it is about the wondrous nature of black holes.
Microbes on ice
Scientists have discovered Arctic algae moving around with ease in icy environments of -15°C (5°F)—the lowest temperatures ever recorded for motility in a eukaryotic lifeform. While some simple microbes can survive lower temperatures, this is the first time that scientists have seen eukaryotic life—organisms with more complex cells containing a nucleus—able to live, thrive, and locomote in such chilly environments.
It’s amazing that these so-called “ice diatoms” can move around at all, but it’s even cooler that they do it in style with a gliding mechanism that researchers describe as a “‘skating’ ability.” Their secret weapon? Mucus threads (“mucilage”) that they use like anchors to pull themselves through frozen substrates.
“The unique ability of ice diatoms to glide on ice” enables them “to thrive in conditions that immobilize other marine diatoms,” said researchers led by Qing Zhang of Stanford University.
Zhang and her colleagues made this discovery by collecting ice cores from 12 locations around the Arctic Chukchi Sea during a 2023 expedition on the research vessel Sikuliaq, which is owned by the National Science Foundation (NSF) and operated by the University of Alaska Fairbanks. Unfortunately, this is a research area that could be destroyed by the Trump administration, with NSF facing 70 percent cuts to its polar research budget.
In other news…
How did Mars get its leopard spots?
If lifeforms are doing triple axels in Arctic ice on Earth, it’s natural to wonder whether alien organisms may have emerged elsewhere. To that end, scientists announced the discovery of a tantalizing hint of possible life on Mars this week.
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NASA’s Perseverance rover turned up organic carbon-bearing mudstones that preserve past redox reactions, which involves the transfer of electrons between substances resulting in one being “reduced” (gaining electrons) and one being “oxidized” (losing electrons). The remnants of those reactions look like “leopard spots” in the Bright Angel formation of Jezero Crater, where the rover landed in 2021, according to the study.
This is not slam-dunk evidence of life, as the reactions can be geological in origin, but they “warrant consideration as ‘potential biosignatures.”
“This assessment is further supported by the geological context of the Bright Angel formation, which indicates that it is sedimentary in origin and deposited from water under habitable conditions,” said researchers led by Joel Hurowitz of Stony Brook University.
The team added that the best way to confirm the origin of the ambiguous structures is to bring Perseverance’s samples back to Earth for further study as part of the Mars Sample Return (MSR) program. Unfortunately, the Trump administration wants to cancel MSR. It seems that even when we have nice things, we still can’t have nice things, a paradox that we all must navigate together.
The last flight of Lucky and Lucky II
About 150 million years ago, a pair of tiny pterodactyls—just days or weeks old—were trying to fly through a cataclysmic storm. But the wind was strong enough to break the bones of their baby wings, consigning them to a watery grave in the lagoon below.
Now, scientists describe how the very storm that cut their lives short also set them up for a long afterlife as exquisitely preserved fossils, nicknamed Lucky and Lucky II, in Germany's Solnhofen limestone.
“Storms caused these pterosaurs to drown and rapidly descend to the bottom of the water column, where they were quickly buried in storm-generated sediments, preserving both their skeletal integrity and soft tissues,” said researchers led by Robert Smyth of the University of Leicester.
“This catastrophic taphonomic pathway, triggered by storm events, was likely the principal mechanism by which small- to medium-sized pterodactyloids…entered the Solnhofen assemblage,” they added.
While it’s sad that these poor babies had such short lives, it’s astonishing that such a clear cause of death can be established 150 million years later. Rest in peace, Lucky and Lucky II.
Trump’s aid cuts could cause millions of deaths from tuberculosis alone
The Trump administration’s gutting of the United States Agency for International Development (USAID), carried out in public fashion by Elon Musk and DOGE, will likely cause millions of excess deaths from tuberculosis (TB) by 2030, reports a sobering new study.
“Termination of US funding could result in an estimated 10.6 million additional TB cases and 2.2 million additional TB deaths during the period 2025–2030,” said researchers led by Sandip Mandal of the Center for Modeling and Analysis at Avenir Health. “The loss of U.S. funding endangers global TB control efforts” and “potentially puts millions of lives at risk.”
Beyond TB, the overall death toll from the loss of USAID is estimated to reach 14 million deaths by 2030. The destruction of USAID must never be memory-holed as it is shaping up to be among the most deadly actions ever enacted by a government outside of war.
Small microbes with big impacts
In more bad news, it turns out that the bacteria that’s responsible for making a lot of Earth’s oxygen is highly vulnerable to human-driven climate change. Prochlorococcus, the most abundant photosynthetic organism on Earth, is the source of about 20 percent of the oxygen in our biosphere. But rapidly warming seas could set off “a possible 17–51 percent reduction in Prochlorococcus production in tropical oceans,” according to a new study.
“Prochlorococcus division rates appear primarily determined by temperature, increasing exponentially to 28°C, then sharply declining,” said researchers led by François Ribalet of the University of Washington. “Regional surface water temperatures may exceed this range by the end of the century under both moderate and high warming scenarios.”
It’s possible that this vital bacteria will adapt by moving to higher latitudes or by evolving more heat-tolerant variants. But that seems like a big gamble on something as important as Earth’s oxygen budget.
Last, we feast
We are far from the first generation to live through unstable times, as evidenced by a new study about the “climatic change and economic upheaval” in Britain during the transition from the Bronze Age to the Iron Age about 3,000 years ago.
These disruptions were traumatic, but they also galvanized new modes of community connection—a.k.a epic parties where people ate, drank, made merry, and dumped the remnants of their revelry in trashpiles called “middens.”
“These vast mounds of cultural debris represent the coming together of vast numbers of people and animals for feasts on a scale unparalleled in British prehistory,” said researchers led by Carmen Esposito of Cardiff University. “This study, the largest multi-isotope faunal dataset yet delivered in archaeology, has demonstrated that, despite their structural similarities, middens had diverse roles.”
"Given the proximity of all middens to rivers, it is likely that waterways played a role in the movement of people, objects and livestock,” the team added. “Overall, the research points to the dynamic networks that were anchored on feasting events during this period and the different, perhaps complementary, roles that different middens had at the Bronze Age-Iron Age transition.”
When in doubt—then as now—have a big party.
Thanks for reading! See you next week.
Trump's 2026 budget plan would cancel NASA's Mars Sample Return mission. Experts say that's a 'major step back'
"They need to change course."Leonard David (Space)
Scientists Just Got an Unprecedented Glimpse into the Nature of Reality
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Subscribe to 404 Media to get The Abstract, our newsletter about the most exciting and mind-boggling science news and studies of the week.Scientists have captured the clearest ever gravitational waves—ripples in the fabric of spacetime—a breakthrough that has resolved decades-old mysteries about black holes and the nature of our reality, according to a study published on Wednesday in Physical Review Letters.
Gravitational waves forged by an ancient merger between two massive black holes reached Earth on January 14 of this year, where they were picked up by the Laser Interferometer Gravitational-Wave Observatory (LIGO) located in Washington and Louisiana. LIGO has discovered hundreds of these waves, but the January event, known as GW250114, is the cleanest detection ever made with a signal-to-noise ratio of 80 (meaning that the signal is about 80 times louder than the noise).
The unprecedented clarity allowed scientists to confirm predictions about black holes that were made a half-century ago by pioneering theorists Roy Kerr and Stephen Hawking, known respectively as the Kerr metric and Hawking area theorem. According to the new study, the results represent “a milestone in the decade-long history of gravitational wave science,” a field that was born in 2015 with the historic first detection of these elusive waves.
“We had promised that gravitational waves would open a new window into the universe, and that has materialized,” said Maximiliano Isi, a gravitational-wave astrophysicist and assistant professor at Columbia University and the Flatiron Institute who co-led the study, in a call with 404 Media.
“Over the past 10 years, the instruments have continued to improve,” added Isi. “We are at a point now where we are detecting a collision of black holes every other day or so. That said, this one detection, which has an extremely high signal-to-noise ratio, really drives home how far this field has come along.”
Gravitational waves are subtle ripples in spacetime that are produced by energetic cosmic events, such as supernovas or mergers between black holes. Albert Einstein was the first to predict their existence in his 1916 general theory of relativity, though he was doubtful humans could ever develop technologies sensitive enough to detect them.
These waves oscillate at tiny distances that are thousands of times smaller than the width of a proton. To capture them, LIGO’s detectors shoot lasers across corridors that stretch for 2.5 miles and act like ultra-sensitive tripwires. The advent of gravitational wave astronomy earned the Nobel Prize in Physics in 2017 and marked the dawn of "multimessenger astronomy,” in which observations about the universe can emerge from different sources beyond light.
GW250114 has a lot in common with that inaugural gravitational wave signal detected in 2015; both signals came from mergers between black holes that are about 30 times as massive as the Sun with relatively slow spins. Gravitational wave astronomy has revealed that black holes often fall into this mass range for reasons that remain unexplained, but the similarity of the 2015 and 2025 events throws the technological progress of LIGO into sharp relief.
“Every pair of black holes is different, but this one is almost an exact twin” to the first detection, Isi said. “It really allows for an apples-to-apples comparison. The new signal is detected with around four times more fidelity, more clarity, and less relative noise than the previous one. Even though, intrinsically, the signal is equally powerful to the first one, it's so much neater and we can see so much more detail. This has been made possible by painstaking work on the instrument.”
The high quality of the signal enabled Isi and his colleagues to test a prediction about black holes proposed by mathematician Roy Kerr in 1963. Kerr suggested that black holes are simple astrophysical objects that can be boiled down to just two properties: mass and spin. GW250114 was clear enough to produce precise measurements of the “ringdown” signatures of the merging black holes as they coalesced into a single remnant, which is a pattern akin to the sound waves from a ringing bell. These measurements confirmed Kerr’s early insight about the nature of these strange objects.
An illustration of the two tones, including a rare, fleeting overtone used to test the Kerr metric. Image: Simons Foundation.
“Because we see it so clearly for the first time, we see this ringing for an extended period where there is an equivocal, clear signature that this is coming from the final black hole,” explained Isi. “We can identify and isolate this ringing from the final black hole and tease out that there are two modes of oscillation.”“It's like having two tuning forks that are vibrating at the same time with slightly different pitches,” he continued. “We can identify those two tones and check that they're both consistent with a single mass and spin. This is the most direct way we have of checking if the black holes out there are really conforming to the mathematical idealization that we expect in general relativity—through Kerr.”
In addition to confirming Kerr’s prediction, GW250114 also validated Stephen Hawking’s 1971 prediction that the surface area of a black hole could only increase, known as Hawking's area theorem. Before they merged, the black holes were each about 33 times as massive as the Sun, and the final remnant was about 63 solar masses (the remaining mass was emitted as energy in the form of gravitational waves). Crucially, however, the final remnant’s surface area was bigger than the combined sum of the areas of the black holes that created it, confirming the area theorem.
“We are in an era of experimental gravitation,” said Isi. “We can study space and time in these dynamically crazy configurations, observationally. That is really amazing for a field that has, for decades, just worked on pure mathematical abstraction. We are hunting these things with reality.”
The much-anticipated confirmation of these predictions puts constraints on some of the most intractable problems in physics, including how the laws of general relativity—which governs cosmic scales of stars and galaxies—can coexist with the very different laws that rule the tiny quantum scales of atoms.
Scientists hope more answers can be revealed by increasingly sophisticated detections from observatories like LIGO and Virgo in Italy, along with future projects like the European Laser Interferometer Space Antenna (LISA), due for launch in the 2030s. Despite LIGO’s massive contribution to science, the Trump administration has proposed big cuts to the observatory and a possible closure to one of its detectors, which would be a major setback.
Regardless of how the field develops in the future, the new discovery demonstrates that the efforts of generations of scientists are now coming to fruition with startling clarity.
“It is humbling to be inscribed in this long tradition,” Isi said. “Of course, Einstein never expected that gravitational waves would be detected. It was a ludicrous idea. Many people didn't think it would ever happen, even right up to 2015. It is thanks to the vision and grit of those early scientists who fully committed despite how crazy it sounded.”
“I hope that support for this type of research is maintained, that I'll be talking to you in 10 years, and I will tell you: ‘Wow, we had no idea what spacetime was like,’” he concluded. “Maybe this is just the beginning.”
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