The new interstellar object 3I/ATLAS is creating quite the buzz. Here's everything we know so far about this cosmic interloper.© 3I/ATLAS inset image Chris Schur, Image created in Canva by Daisy ...

A mystery interstellar object discovered last week is likely to be the oldest comet ever seen—possibly predating our solar system by more than 3 billion years, researchers say.

If 3I/ATLAS turns out to be much bigger, 10 kilometers (six miles) or more, this would pose problems for preexisting estimates of how many big interstellar objects reside in the galaxy.

Anatomy of an interstellar object Comet 3I/ATLAS follows two other intriguing interstellar objects, called ISOs, that once passed through our solar system: ‘Oumuamua in 2017 and 2I/Borisov in 2019.

3I/ATLAS is only the third interstellar object detected visiting our solar system, after 1I'Oumuamua in 2017 and 2I/Borisov in 2019.

Interstellar objects are visitors from solar systems beyond our own, and the third ever such object, known as 3I/ATLAS, has just been discovered. Using the Gemini North telescope, astronomers have ...

The new observatory, which released its first images of the cosmos on June 23, 2025, is expected to discover between 5 and 50 interstellar objects as they zip through the solar system during the ...

Anatomy of an interstellar object Comet 3I/ATLAS follows two other intriguing interstellar objects, called ISOs, that once passed through our solar system: ‘Oumuamua in 2017 and 2I/Borisov in 2019.

On July 2, NASA revealed the existence of 3I/ATLAS, only the third ever interstellar object observed in the universe. These are objects that exist in interstellar space—the areas between stars ...

Comet 3I/ATLAS follows two other intriguing interstellar objects, called ISOs, that once passed through our solar system: ‘Oumuamua in 2017 and 2I/Borisov in 2019. Both objects, also thought to be ...