A recent study showed that Mars was warm and wet billions of years ago. The finding contrasts with another theory that this era was mainly cold and icy. The result has implications for the idea that life could have developed on the planet at this time.

Whether Mars was once habitable is a fascinating and intensely researched topic of interest over many decades. Mars , like the Earth, is about 4.5 billion years old and its geological history is divided into different epochs of time.

The latest paper relates to Mars during a time called the Noachian epoch, which extended from about 4.1 to 3.7 billion years ago. This was during a stage in solar system history called the Late Heavy Bombardment (LHB) . Evidence for truly cataclysmic meteorite impacts during the LHB are found on many bodies throughout the solar system.

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On Friday afternoon, Ars Technica published an article containing fabricated quotations generated by an AI tool and attributed to a source who did not say them. That is a serious failure of our standards. Direct quotations must always reflect what a source actually said.

That this happened at Ars is especially distressing. We have covered the risks of overreliance on AI tools for years, and our written policy reflects those concerns. In this case, fabricated quotations were published in a manner inconsistent with that policy. We have reviewed recent work and have not identified additional issues. At this time, this appears to be an isolated incident.

Ars Technica does not permit the publication of AI-generated material unless it is clearly labeled and presented for demonstration purposes. That rule is not optional, and it was not followed here.

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It was the image that launched a cultural icon. In 1967, in the Northern California woods, a 7-foot-tall, ape-like creature covered in black fur and walking upright was captured on camera, at one point turning around to look straight down the lens. The image is endlessly copied in popular culture—it’s even become an emoji. But what was it? A hoax? A bear? Or a real-life example of a mysterious species called the Bigfoot?

The film has been analysed and re-analysed countless times . Although most people believe it was some sort of hoax, there are some who argue that it’s never been definitively debunked. One group of people, dubbed Bigfooters, is so intrigued that they have taken to the forests of Washington, California, Oregon, Ohio, Florida, and beyond to look for evidence of the mythical creature.

But why? That’s what sociologists Jamie Lewis and Andrew Bartlett wanted to uncover. They were itching to understand what prompts this community to spend valuable time and resources looking for a beast that is highly unlikely to even exist. During lockdown, Lewis started interviewing more than 130 Bigfooters (and a few academics) about their views, experiences, and practices, culminating in the duo’s recent book "Bigfooters and Scientific Inquiry: On the Borderlands of Legitimate Science."

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NASA Administrator Jared Isaacman said Saturday the agency is looking at ways to prevent the fueling problems plaguing the Space Launch System rocket before the Artemis III mission.

Artemis III is slated to be the first crew mission to land on the Moon since the Apollo program more than 50 years ago. As for Artemis II, which remains on the launch pad at Kennedy Space Center in Florida after missing a launch window earlier this month, NASA is preparing for a second countdown rehearsal as soon as next week to confirm whether technicians have resolved a hydrogen fuel leak that cut short a practice countdown run February 2.

Artemis II is the first crew flight for SLS rocket and Orion spacecraft. The nearly 10-day mission will carry four astronauts around the far side of the Moon and return them to Earth.

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It's Valentine's Day, and while there are plenty of classic and current rom-coms out there for those wishing to immerse themselves in warm and fuzzy feelings, we're opting to celebrate in a different way: honoring Ang Lee's 2000 masterpiece Crouching Tiger, Hidden Dragon , a wuxia tragic fairy tale featuring one of the most beautifully heartbreaking love stories in film at its center. It's also got stunning cinematography and tons of awe-inspiring martial arts sequences, which makes it my personal perfect date night movie.

(Spoilers below, but we will give you a heads up before the major reveals.)

The film is adapted from a 1940s novel by Wang Dulu and is set sometime during the Qing dynasty, which lasted from 1644 through 1912. (No specific date is given.) The title is a direct translation of a line from a 6th century Chinese poem: "behind the rock in the dark probably hides a tiger, and the coiling giant root resembles a crouching dragon." It's generally interpreted as a description of legendary martial arts masters living un-noticed and/or hiding in plain sight—until someone picks a fight, that is. And some of those hidden masters are women.

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Out beyond the orbit of Neptune lies an expansive ring of ancient relics, dynamical enigmas, and possibly a hidden planet—or two.

The Kuiper Belt , a region of frozen debris about 30 to 50 times farther from the sun than the Earth is—and perhaps farther, though nobody knows—has been shrouded in mystery since it first came into view in the 1990s.

Over the past 30 years, astronomers have cataloged about 4,000 Kuiper Belt objects (KBOs), including a smattering of dwarf worlds, icy comets, and leftover planet parts. But that number is expected to increase tenfold in the coming years as observations from more advanced telescopes pour in. In particular, the Vera C. Rubin Observatory in Chile will illuminate this murky region with its flagship project, the Legacy Survey of Space and Time (LSST), which began operating last year. Other next-generation observatories, such as the James Webb Space Telescope (JWST), will also help to bring the belt into focus.

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On Thursday, OpenAI released its first production AI model to run on non-Nvidia hardware, deploying the new GPT-5.3-Codex-Spark coding model on chips from Cerebras. The model delivers code at more than 1,000 tokens (chunks of data) per second, which is reported to be roughly 15 times faster than its predecessor. To compare, Anthropic's Claude Opus 4.6 in its new premium-priced fast mode reaches about 2.5 times its standard speed of 68.2 tokens per second , although it is a larger and more capable model than Spark.

"Cerebras has been a great engineering partner, and we're excited about adding fast inference as a new platform capability," Sachin Katti, head of compute at OpenAI, said in a statement.

Codex-Spark is a research preview available to ChatGPT Pro subscribers ($200/month) through the Codex app, command-line interface, and VS Code extension. OpenAI is rolling out API access to select design partners. The model ships with a 128,000-token context window and handles text only at launch.

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Vinay Prasad, the Trump administration's top vaccine regulator at the Food and Drug Administration, single-handedly decided to refuse to review Moderna's mRNA flu vaccine , overruling agency scientists, according to reports from Stat News and The Wall Street Journal.

Stat was first to report, based on unnamed FDA sources, that a team of career scientists at the agency was ready to review the vaccine and that David Kaslow, a top career official who reviews vaccines, even wrote a memo objecting to Prasad’s rejection. The memo reportedly included a detailed explanation of why the review should proceed.

The Wall Street Journal confirmed the report with its own sources, who added that FDA scientists attended an hourlong meeting with Prasad in early January, in which they laid out their objections to Prasad's plans to block the vaccine review. They reportedly told Prasad—a political appointee known for causing turmoil and espousing anti-vaccine rhetoric—that it was the wrong approach.

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Nicolas Cage has carved out a quirky niche for himself in recent years with such films as Color Out of Space (2019), Pig (2021), The Unbearable Weight of Massive Talent (2022), Dream Scenario (2023), and Longlegs (2024), among others. Now he's starring in Spider-Noir , a new live-action series based on the Marvel Comics character. Cage plays an aging private investigator and disillusioned superhero in 1930s New York. Prime Video released the first teaser in two forms: one in black and white—very Raymond Chandler-esque—and another in color, which the showrunners are calling "True Hue."

Marvel Comics created its "noir" line in 2009, reinterpreting familiar Marvel characters in an alternate universe, usually set during the Great Depression in the US. A version of the Spider-Noir character, voiced by Cage, briefly appeared in the animated masterpieces, Spider-Man: Into the Spider-Verse (2018) and Across the Spider-Verse (2023). (He is set to reprise that role in the upcoming Beyond the Spider-Verse .)

Co-showrunner (with Steve Lightfoot) Oren Uziel is a film noir fan, so that Marvel series naturally appealed to him. The live-action series is still set in 1930s New York, but the spidery superhero is not Peter Parker. (Uziel thought the Parker character was too associated with a boyish high school type, which didn't really fit the noir vibe.) So Cage is playing Ben Reilly, a hard-boiled PI with a secret superhero identity, The Spider. Cage has described his portrayal as "70 percent Humphrey Bogart [specifically The Big Sleep ] and 30 percent Bugs Bunny," which seems pretty on point for Cage's distinctively flamboyant style.

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