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

Only three objects from beyond our solar system have ever been caught passing through it. The first, 1I/’Oumuamua, arrived in ...

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

Juice observed 3I/ATLAS during perihelion, when Earth-based telescopes could not. Spectroscopic observations measured water ...

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

NASA's James Webb Space Telescope is finding clues that are leading scientists toward the origins of the interstellar comet ...