Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's ...

The largest interstellar comet discovered could be an alien technology. The newly found Manhattan-sized object, named ...

Using data from the Vera C Rubin Observatory, experts have revealed just how big the object, dubbed 3I/ATLAS, really is.

New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

Discovered in July 2025, 3I/ATLAS is the third confirmed interstellar visitor traversing our solar system, following ...

How do we know 3I/ATLAS, also called comet C/2025 N1 (ATLAS), is interstellar? Will it strike Earth? Can we visit it? Here ...

A mysterious visitor from another solar system could be an alien spacecraft, according to a leading Harvard astronomer.

A controversial new study suggests that 3I/ATLAS, a fast-moving interstellar object, could be an alien spycraft posing a ...

After a scientist claimed a 'hostile alien threat' could attack Earth within months NASA has weighed in on the situation.

The celestial body's unusual orbit “implies that something extraordinary occurred" in the early days of the solar system—and ...

A curious, icy and distant object has just been discovered far beyond Pluto. Nicknamed Ammonite, it intrigues astronomers ...