For millions of years, a frozen wanderer drifted between the stars before slipping into our solar system as 3I/ATLAS—only the ...

The fate of a comet that was predicted to pass close to Earth remains a mystery five years after its dramatic breakup in the inner solar system.

Friday, Dec. 19 is the day that astronomers, amateur stargazers and alien conspiracy theorists alike have been waiting for: Interstellar comet 3I/ATLAS is as close to Earth as it will ever get. But ...

Today is the day that astronomers, amateur stargazers and alien conspiracy theorists alike have been waiting for: interstellar comet 3I/ATLAS is as close to Earth as it will ever get. But lest you ...

An experiment to quantify the amount of the universe’s lightest element in Earth’s core suggests that the planet’s water has ...

Learn about a new Kreutz sungrazing comet that could be lighting up our skies come April 2026.

3I/ATLAS, an interstellar object identified by NASA as a comet, will swing by Earth in its closest approach this week. Scientists have been tracking the comet’s grand tour of our solar system since it ...

If you're looking at the night skies Wednesday and make out a tiny green light in the sky, don't panic, aliens haven't landed. A rare green comet that has been traveling through our solar system for ...