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

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

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

On Sept. 11, 1985, the International Cometary Explorer, or "ICE" became the first spacecraft to fly by a comet. Originally ...

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

A telescope in Chile recently glimpsed 3I/ATLAS' glowing tail, which observations reveal has grown as the interstellar object ...

The images of Comet 3I/ATLAS were captured by the Gemini South telescope at Cerro Pachón in Chile on Aug. 27 as the icy ...

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

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

Do we know what space actually smells like? And what about other planets, moons, and celestial bodies? Here's what the ...

Observations from the James Webb Space Telescope reveal unexpectedly high levels of carbon dioxide coming off 3I/ATLAS, ...

These new images confirm that the comet is becoming more active as it plows harmlessly through our solar system, according to ...