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, ...

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

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 ...

NASA STEREO-A satellite's SECCHI/HI-2 camera captured this imagery of Comet C/2021 A1 (Leonard) Credit: Space.com | footage courtesy: NASA/NRL/B.Gallagher | edited by Steve Spaleta ...

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

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

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

Two more of NASA's space telescopes got another look at comet 3I/ATLAS, an interstellar interloper that captured the world's attention in July 2025.

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