Astronomers say that mysterious interstellar visitors like 'Oumuamua and 3I/ATLAS are the most common large bodies in the ...

This unexpected color raises new questions about the alien chemistry of comets from beyond our solar system. On Sept. 7 2025, ...

The eyes of every astronomer widened this year when an interstellar traveler was discovered in our solar system.

NASA has firmly debunked a Harvard astronomer's suggestion that an interstellar comet passing through our solar system might ...

But over the summer, 3I/ATLAS, has plunged toward the inner solar system—and the fireworks show has begun in earnest. When ...

Gemini South caught Comet 3I/ATLAS “switching on,” as students and astronomers joined to see dust, gas, chemistry from ...

Comet 3I/ATLAS is the third ISO ever detected. It was discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) ...

The comet, which poses no risk to Earth, first burst onto the scene July 1, spotted by NASA’s ATLAS survey telescope in Chile ...

A new image shows the growing tail of a comet from another star system streaking across our solar system. The image of comet ...

This quiz invites you to chase comets through time and space, from ancient omens to modern scientific marvels.

Learn about the comet impact hypothesis that may explain why North America lost most of its megafauna along with the Clovis ...