
On Dec. 19, 2025, 3I/ATLAS flew by Earth and did more than just give astronomers something to look at; it brought a piece of a far-off, alien world into our backyard. This cosmic vagabond moves at an incredible 130,000 miles per hour and is only the third interstellar object ever confirmed to have visited our solar system.
3I/ATLAS is a true outsider, unlike the comets that orbit our sun. It was probably born more than seven billion years ago in the galactic thick disc, making it older than the Earth itself. It moves much faster than 'Oumuamua and Borisov, and its path is so 'hyperbolic' that it looks almost straight to the naked eye.