Researchers say 3I/ATLAS could be 12 billion years old and has a composition unlike anything in our solar system.

A new moon tonight (July 14) may be the best time to spot Comet 10P/Tempel 2 in Arizona as it makes its return for the first ...

Interstellar comet, 3I/ATLAS, might be one of the oldest celestial bodies ever seen, potentially forming 10 to 12 billion years ago. This ancient visitor, detected in July 2025, could offer ...

Interstellar comet 3I/ATLAS has given astronomers an opportunity they rarely expect to receive. Unlike the countless icy bodies that circle the Sun, this object formed around another star before ...

Exactly where the comet 3I/ATLAS came from within the Milky Way remains a mystery.

One year ago, on July 1, 2025, astronomers discovered a fascinating new object moving through the solar system. Detected by the Asteroid Terrestrial-impact Last Alert System (ATLAS), the object was ...

An interstellar comet that blazed past the sun last year could be nearly three times older than our solar system and is unlike anything ever seen before in our cosmic backyard, astronomers said Monday ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. A comet is now visible in the predawn sky across the ...