This archived news story is available only for your personal, non-commercial use. Information in the story may be outdated or superseded by additional information. Reading or replaying the story in ...

Astronomers have observedunexpected activity in C/2014 UN271, the largest comet ever detected from the Oort Cloud, while it remains over a billion miles from the Sun. Using the ALMA radio telescope, ...

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 ...

A giant comet, likely the largest comet discovered in modern times, is on its way toward the sun. Scientists caught sight of the comet early, giving researchers years to watch it evolve and streak ...

The interstellar comet 3I/ATLAS, believed to have originated from outside our solar system, was first detected in July 2025 by the ATLAS survey telescope and has sparked curiosity among scientists.

We've only known about its existence for a few short weeks, and already astronomers have been able to learn a lot about the mysterious interstellar comet 3I/ATLAS. The object was detected on 1 July ...