Comet 3I/ATLAS arrived from beyond the Solar System carrying a chemical story unlike anything astronomers had measured before. In the gas around it, they found isotope ratios that do not match the ...

December just got an upgrade — and it’s not holiday traffic or year-end parties. It’s 3I/ATLAS, a visitor from another star system, casually cruising through our solar neighbourhood like it owns the ...

NASA’s Hubble Space Telescope captured a deeper look at interstellar comet 3I/ATLAS, with its Wide Field Camera 3 instrument, as it zoomed through the solar system on Nov. 30. The Wide Field Camera 3 ...

Harvard astronomer, Avi Loeb, speculates it could be an artificial alien object. NASA experts maintain that the object appears to be a natural comet with unique variations. Rare interstellar object 3I ...

Here’s how to keep your 3I on it. With 3I/ATLAS slated to make its Earth tour in two days, amateur photographers and astronomers alike are scrambling to catch sight of the interstellar comet. Our ...

Stargazers and scientists are getting a holiday present from the cosmos this week. 3I/ATLAS, an interstellar comet, will get “closest” to Earth on Friday, December 19, as part of its journey across ...

The most sensational story of the year for astronomers has been the discovery of the comet 3I/ATLAS, which was first observed on July 1, 2025 by NASA's Asteroid Terrestrial-impact Last Alert System ...

Every few years, something slips through our cosmic neighborhood that doesn't belong here. It arrives from somewhere out past the edge of the Sun's gravity, moves too fast to have started its journey ...

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Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. A deep image of interstellar Comet 3I/ATLAS captured by the ...