For example, the first mile-sized planetesimals in our solar system–which grew to become celestial bodies like Earth or Jupiter’s core–formed right after the condensation of these same ...

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's not aliens.) ...

What can a newly discovered interstellar comet teach scientists about solar system formation and evolution? This is what a recent study presented at the National Astronomy Meeting 2025 hopes to ...

Scientists now say the 3I/ATLAS interstellar comet discovered earlier this month could be one of the oldest that astronomers have ever encountered and some 3 billion years older than our solar system.

A rare interstellar comet is flying through our solar system. Here's how—and when—you might be able to see Comet ATLAS from your backyard.

The European Southern Observatory has captured the clearest images yet of the interstellar visitor 3I/ATLAS as it moves inward through the solar system.

Astronomers say they've spotted an object from another part of the Milky Way galaxy in our solar system.

Astro Bob: Rare interstellar comet pays a visit to our solar system Astronomers discovered a new comet that hails from a star system long ago and far away.

WASHINGTON, July 3 >> Astronomers are tracking a newly spotted comet hailing from parts unknown, only the third time such an interstellar object has been observed visiting our solar system.

A Manhattan-sized interstellar comet, named 31/ATLAS, was spotted blazing through our solar system – marking only the third time a mysterious object from beyond our cosmic neighborhood has been ...

Astronomers have observed an object that originated from beyond our solar system, thought to be an interstellar comet, speeding through our celestial neighborhood.