Based on the composition of gases spewed by the icy space rock, researchers estimate that our guest might be up to 12 billion ...

I/ATLAS arrived fast, bright, and strange. When astronomers spotted it on July 1, 2025, they knew almost immediately this was no ordinary comet.

Astronomers first spotted Comet 3I/ATLAS in June 2025, and it was later confirmed as an interstellar visitor that originated ...

An interstellar comet that blazed past the sun last year could be nearly three times older than our solar system and is ...