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

SETI researchers found no alien signals on interstellar object 3I/ATLAS, but the study refines future searches and expands ...

PARIS, France — An interstellar comet that blazed past the Sun last year could be nearly three times older than our Solar ...

One year ago, on July 1, 2025, astronomers discovered a fascinating new object moving through the solar system. Detected by the Asteroid Terrestrial-impact Last Alert System (ATLAS), the object was ...

Interstellar comet, 3I/ATLAS, might be one of the oldest celestial bodies ever seen, potentially forming 10 to 12 billion ...

SETI scientists searched the interstellar object 3I/ATLAS for radio signals that could indicate extraterrestrial technology ...

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

Scientists have identified interstellar comet 3I/ATLAS as the oldest known object to pass through the solar system, dating ...

Exactly where the comet 3I/ATLAS came from within the Milky Way remains a mystery.

In July 2025, astronomers detected the third known interstellar object ever observed passing through our solar system—an ancient, carbon-dioxide–rich comet traveling at extraordinary speed. Named 3I ...

Observations suggest comet spent billions of years on ‘vast unimaginable trajectories’ around our galaxy ...