Something strange is happening on the outskirts of our Solar System. It could be a large, mysterious planet. Or, it could be ...

Based on evidence collected by the James Webb Space Telescope, researchers have found that interstellar comet 3I/ATLAS could ...

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

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 ...

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

While life on Mars (and Venus) has long been an obsession for those wondering if we're alone, there are other places in our ...

This cosmic visitor is now officially named 3I/ATLAS, and it appears to be a comet from another solar system. Reading time 3 minutes Update: July 3, 09:24 a.m. ET: On Wednesday, July 2, the ...

It may not feel like it, but everything in the universe is in constant motion. Our Sun, with all its planets, orbits the center of the Milky Way, flying through the cosmos at around 450,000 miles per ...

A meteorite found in the Sahara is forcing scientists to rethink what kinds of worlds once circled the young sun. The rock, ...

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