Later in December, the 3I/ATLAS interstellar comet will get as close to Earth as it ever will. Here's what to know.

A comet known as 3I/ATLAS made news in July when it was confirmed to have originated outside Earth's solar system. One infamous theory even posited that the interstellar interloper, estimated to be ...

A newly found interstellar comet poses absolutely no threat to Earth, but a NASA-coordinated group plans to observe it to help our ability to monitor any future objects that might prove to be ...

Comet Tsuchinshan-ATLAS is nearing Earth and getting brighter. By Katrina Miller Katrina Miller last wrote about a comet — Pons-Brooks — in April. Look up, stargazers: A comet discovered last year is ...

It’s doing a Sun run. Manhattan-sized comet 3I/ATLAS — which scientists suspect could have extraterrestrial origins — will reach its closest approach to the Sun on October 30. While ATLAS doesn’t ...

For four months, social media has drawn skywatchers and lovers of galactic lure to a speck spotted in July. A new visitor from beyond our solar system University of Texas at Arlington Astrophysicist ...