Everyone's favorite interstellar comet, 3I/ATLAS, flew past Earth overnight, coming within about 168 million miles (270 million kilometers) of our planet.

A mysterious interstellar comet known as 3I/ATLAS is about to make its closest approach to Earth in December 2025. Here's everything to know about it.

Today is one astronomers, stargazers and alien conspiracy theorists have been waiting for: interstellar comet 3I/ATLAS is as close to Earth as ever.

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. C/2020 F3 (NEOWISE), or Comet NEOWISE, is a retrograde comet ...