A team of astronomers has made a groundbreaking discovery by detecting molecular activity in comet C/2014 UN271 (Bernardinelli-Bernstein)—the largest and second most distantly active comet ever ...

Two bright green comets are streaming through the skies and are visible to skygazers in the Northern Hemisphere. Both hail from the outer edges of our solar system — possibly what's known as the Oort ...

Astronomers have detected a gigantic comet — possibly the largest ever discovered — and it’s spewing gases from its nucleus as it shoots through our cosmic neighborhood. “These measurements give us a ...