It was "full-on erupting" during its flyby of the Sun. The post 3I/ATLAS Spraying Material as It Exits the Solar System ...

Out in the Kuiper Belt, the massive doughnut of debris beyond Neptune, about one in 10 kilometer-scale objects have surprised scientists with their unexpected shape. Rather than resembling a ball, ...

Comet 3I/ATLAS, the third confirmed interstellar object ever detected passing through our solar system, was caught shedding ...

What would happen if another sun also brought its planets along for the ride?

A planetary system 116 light-years from Earth has a peculiar pattern. It could flip the script on how planets form, scientists say.

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

The interstellar visitor, only the third such object to be discovered passing through our solar system, ignited controversial ...

Surprised astronomers said Thursday they have discovered a star with planets in a bizarre order that defies scientific ...

New infrared observations reveal that the rare interstellar visitor known as comet 3I/ATLAS has dramatically brightened during its farewell tour of the solar system.

Comet 3I/ATLAS was full-on erupting into space in December 2025, after its close flyby of the sun, causing it to significantly brighten. Even water ice was quickly sublimating into gas in ...

As interstellar object 3I/ATLAS departs our solar system, it's releasing a surprising amount of water and ancient, carbon-rich material into space.