Astronomers have made a groundbreaking discovery—an interstellar object, named 3I/ATLAS, as large as Tokyo, is emitting a ...

A cosmic coincidence could give us an unprecedented look at a visitor from another solar system. If all goes well.

The interstellar comet 3I/ATLAS is barreling toward its closest point to the sun as perihelion looms on Oct. 29. How different will it look when it reappears on the other side?

Captured at the Teide Observatory in Spain's Canary Islands, the composite image was created by stacking 159 separate ...

Astronomers recently discovered a rare interstellar object passing through our solar system, and a Harvard physicist is sounding the alarm that its strange characteristics might indicate it’s more ...

The discovery of interstellar object 3I/ATLAS coincides with SETI's proposed new post-detection rules—raising public fears of ...

The Gemini South telescope captured new images of the interstellar comet 3I/ATLAS, which will make its closest approach to Earth in October. Credit: International Gemini Observatory / NOIRLab / NSF / ...

A comet from another star system will swing by Mars on Friday as a fleet of spacecraft trains its sights on the interstellar visitor. The comet known as 3I/Atlas will hurtle within 18 million miles ...

A mysterious interstellar object will be visible for a couple more nights before it gets too close to the sun to observe, according to NASA. Comet 3I/ATLAS, the third interstellar object ever detected ...