Technologies

Space Cities Inside Asteroids Could Actually Work, Scientists Say

The plan «on the edge of science and science fiction» involves an asteroid, an expandable mesh bag and a whole lot of audacity.

Good news, Earthlings. We have more to look forward to than just the drab landscape of the moon or the inhospitable surface of Mars when it comes to far-flung future human civilizations off this rock. We might one day be living la vida asteroid.

Yes, space-faring piles of rocky rubble (like famous asteroid Bennu) could be home sweet home. A group of scientists at the University of Rochester in New York worked out a plan for turning asteroids into spinning space cities with artificial gravity. The researchers published a «wildly theoretical» study in Frontiers in Astronomy and Space Sciences earlier this year.

«Our paper lives on the edge of science and science fiction,» said co-author Adam Frank in a University of Rochester statement last week. Frank is a professor of physics and astronomy at the school.

The basic concept behind the asteroid city builds on an idea called the O’Neill cylinder, a rotating space colony design proposed by physicist Gerard O’Neill in the 1970s. The rotation creates artificial gravity. Think of something along the lines of the cylindrical Cooper Station in the movie Interstellar. It’s a fascinating idea, but it would be difficult and expensive to transport enough material into space to make a large-scale O’Neill cylinder.

This is where things get wilder. The Rochester research team proposes a way to turn a rock pile of an asteroid into a cylinder by surrounding it with a thin, high-strength mesh bag made from carbon nanofibers. It would have an accordion-like design.

«A cylindrical containment bag constructed from carbon nanotubes would be extremely light relative to the mass of the asteroid rubble and the habitat, yet strong enough to hold everything together,» said study co-author Peter Miklavcic, a doctoral candidate in mechanical engineering.

Spinning an asteroid would cause its rubble to break apart, expanding the bag and creating a layer of rock against it. That layer would provide radiation shielding for a colony inside the cylinder while the continued spin would create artificial gravity.

It sounds far-fetched, but Frank said the technologies and engineering behind the asteroid city technically obey the laws of physics. «Based on our calculations, a 300-meter-diameter asteroid just a few football fields across could be expanded into a cylindrical space habitat with about 22 square miles of living area,» Frank said. «That’s roughly the size of Manhattan.»

Of course, bagging and spinning an asteroid wouldn’t be simple. The researchers suggest using solar-powered rubble cannons to get the spin going. There’s also the matter of constructing a human-safe colony on the interior, but we can leave those challenges for the future.

Sci-fi writers have long envisioned life on asteroids. The paper provides a new way of thinking through that possibility in a way that could protect human occupants and make them feel more at home. It’s a good companion piece to another recent space thought experiment that offered up a plan for building a «forest bubble» on Mars.

My imagination is now taking me from my cozy quarters inside an asteroid to a vacation destination in a Martian nature reserve. This may not be relegated to the realm of sci-fi forever. «Space cities might seem like a fantasy now,» Frank said, «but history shows that a century or so of technological progress can make impossible things possible.»

Technologies

Pluto TV to Stream 49 ‘Survivor’ Seasons for Free

The 50th season of the competition series is set to air on CBS in February.

Pluto TV might help you plan your next reality TV binge. All 49 seasons of the competition series Survivor will stream on demand on the service later this month.

The Survivor catalog will arrive ahead of the landmark 50th season of Survivor, which airs on CBS on Feb. 25. You can currently watch the previous 49 seasons with a Paramount Plus subscription, which starts at $8 per month (or $9 after a price hike on Jan. 15). Pluto’s route is free, but it comes with ads.

There will be two ways to watch: Pluto’s dedicated 24/7 Survivor channel, which will stream episodes in chronological order, or you can stream episodes on demand.

The channel marathon and on-demand availability begin on Jan. 24 at 5:15 p.m. ET.

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For more information on Pluto and other free, ad-supported streaming services, check out our roundup of the best options.

Technologies

Apple Picks Google Gemini to Power Siri

Sorry OpenAI, Apple went back to its old lover.

Apple has chosen Google’s Gemini to power its next iteration of Siri, coming later this year, both companies said in a joint statement on Monday.

Apple and Google’s Siri deal follows months of rumors saying that the iPhone maker had chosen Gemini to advance Siri over OpenAI’s ChatGPT. A report in November said that Apple would pay Google $1 billion per year for Google’s AI prowess. It helps that last November’s release of Gemini 3 made a huge impact and reportedly put OpenAI in a «code red» position.

«After careful evaluation, Apple determined that Google’s Al technology provides the most capable foundation for Apple Foundation Models and is excited about the innovative new experiences it will unlock for Apple users,» according to the statement on Monday. «Apple Intelligence will continue to run on Apple devices and Private Cloud Compute, while maintaining Apple’s industry-leading privacy standards.»

Google referred to the joint statement when asked for comment. Apple didn’t immediately respond to a request for comment.

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Despite Apple being one of the most valuable companies in the world, it’s behind in the AI race. Instead of developing its own foundational models, which reports suggested hadn’t been going well, Apple instead worked with OpenAI to power Apple Intelligence. Even with the Siri refresh under Apple Intelligence, Apple’s AI assistant fell short of expectations, although subsequently it’s proving to be more useful.

Apple’s deal with Google further marries two American tech giants who had already been exchanging billions of dollars. During the Department of Justice antitrust trial against Google, court documents showed that Google paid Apple $20 billion in 2022 to ensure that Google Search would remain the default search engine across Apple devices. Now, some of that money will be flowing back to Google so that Siri can get a much-needed leveling up.

(Disclosure: Ziff Davis, CNET’s parent company, in April filed a lawsuit against OpenAI, alleging it infringed Ziff Davis copyrights in training and operating its AI systems.)

Technologies

Samsung’s Galaxy Z TriFold Is a Phone-Tablet Hybrid With a Clear Purpose

I got my hands on the new foldable at CES. It feels like a wildly practical two-in-one device, thanks to the massive display and overall sleek build.

I’ve tested my fair share of thin and foldable phones over the years, but something about Samsung’s Galaxy Z TriFold struck me as particularly unique when I held it for the first time at CES 2026 in Las Vegas.

At last, it seems foldables are approaching their long-desired goal: a two-in-one device that fits neatly in your pocket.

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The Galaxy Z TriFold — which technically folds twice but has three panels — is like a true phone-tablet hybrid that stands apart from its bar-style counterparts. Its value lies less in flashy specs about its thinness and more in its utility and practicality.

Yes, the Galaxy Z TriFold feels impressively sleek when open: It’s just 3.9mm at its thinnest point and 4.2mm at its thickest, not accounting for the camera bump. It also feels wonderfully normal in my hands, to the degree that I didn’t really think about its weight of 309 grams as I used it.

Still, the foldable doesn’t inspire the same ergonomic awe as Samsung’s book-style Galaxy Z Fold 7 or the bar-style Galaxy S25 Edge, which primarily lean on an ultrathin, lightweight design.

The Galaxy Z TriFold is all about getting things done on a portable scale. Need to shoot off a quick text or check an email? The 6.5-inch cover display is similar to using a nonfolding phone — minus the slightly chunky 12.9mm thickness when the trifold is closed. And when it’s time to watch a movie, multitask or type up a paper, the expansive 10-inch internal display offers plenty of real estate.

Read more: The Samsung Galaxy Z TriFold was selected as a winner in the Best Mobile Tech category for the Official Best of CES 2026 Awards.

That duality makes the Galaxy Z TriFold work like a true hybrid device, filling a niche that book-style foldables have yet to satisfy, despite their numerous efforts.

Comparing the Z TriFold and the Z Fold 7 at a glance

Placing Samsung’s Z TriFold and its two-panel Galaxy Z Fold 7 side by side underscored just how different each phone is.

Yes, you can watch videos at a larger scale on the Z Fold 7’s inside display, but that experience pales in comparison to the true tablet-like feel of the unfurled Z TriFold. You can open up to three apps simultaneously on both phones, but doing so on the trifold feels like a less significant compromise thanks to its larger screen. And with Samsung DeX, turning your phone into a mini computer of sorts has never felt more practical, since there’s more room to work with.

One of the biggest indicators of how far foldables have come is the fact that both the Z TriFold and the Z Fold 7 pack pretty impressive cameras: a 200-megapixel wide, 12-megapixel ultrawide and 10-megapixel telephoto camera on the back, along with two 10-megapixel selfie cameras. So if you’re choosing between the larger and smaller Samsung foldables, that’s one key factor they have in common.

Two hinges on the trifold means double the screen creases, but they’re thankfully less visible than the Z Fold 7’s, which is already pretty subdued. Learning how to close the trifold correctly can be a bit of a learning curve, especially if you’re right-handed like me; you’ll need to close the left panel first. But each time you (I) mess up, the phone gives haptic feedback and an alert that you (we) are doing it wrong, which is helpful.

What’s perhaps most assuring is the trifold’s 5,600-mAh battery, which can hopefully allow the phone to power through a full day’s use, and then some. The Z Fold 7 has a 4,400-mAh battery, which lasted all day in my initial testing, but without much juice to spare. Hopefully, the Z TriFold remedies that. The trifold’s 45-watt super-fast charging is a nice perk, too.

Speaking of charging: Samsung told me the Z TriFold will come with not just a charging cable in the box, but also a charging brick. Nature is healing.

US release and price

The Z TriFold is already available in Korea, China, Taiwan, Singapore and the United Arab Emirates. In fact, my colleague Prakhar Khanna beat me to the punch and got his hands on the phone in Dubai last month.

Samsung has said the Z TriFold will launch in the US in the first quarter of this year. It’ll be interesting to see if people in the US respond similarly to those in other countries like Korea, where the phone reportedly sold out in minutes.

Another looming question remains: the price. Samsung didn’t share the US price at CES, but we’ll likely learn more as we approach the (also unknown) release date. Given the Z Fold 7’s $2,000 price tag, though, you might want to start saving up now.