The comet that rambled past us from another star last year likely originated in a cold, isolated corner of the galaxy that ...

New observations of the interstellar comet 3I/ATLAS include the first measurement of the abundance of deuterated water ...

The interplanetary comet 3I/ATLAS is remarkably rich in a specific type of water that contains deuterium, meaning it came ...

Astronomers knew 3I/ATLAS wasn’t a local comet not long after first spotting it in July 2025. As only the third interstellar ...

Rare interstellar comet 3I/ATLAS is revealing clues about the early Milky Way, offering scientists a glimpse into conditions ...

Scientists have traced interstellar comet 3I/ATLAS to an extremely cold, isolated region of the galaxy, possibly dating back 10–12 billion years. Its unusually high deuterium content suggests it ...

Study shows 3I/ATLAS formed somewhere colder and with lower levels of radiation ...

A rare celestial event is unfolding above Earth as a distant comet makes its way through the inner solar system for the first ...

Comets are pristine remnants left over from the solar system's formation 4.6 billion years ago, rather than younger fragments created by collisions between larger bodies, a new study suggests. The ...

It's possibly as big as Manhattan, likely older than our own solar system and it's traveling through space at speeds of up to 153,000 miles per hour. It's also only the third confirmed interstellar ...