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

The findings surprised researchers, who used the comet's composition to better understand the environment in which it formed.

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

Strange interstellar comet speculated to be alien spacecraft is older than Solar System - Scientists say comet represents ...

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

For a long time, Earth’s ending seemed settled. In about five billion years, the sun will swell into a giant, the inner Solar ...

Astronomers studying the intriguing comet 3I/ATLAS on Monday said that this visitor is incredibly ancient, potentially nearly ...

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