An interstellar object has been spotted moving at a speed of 60km/sec in the solar system, only the third such object ever discovered. That doesn't mean there aren't other such bodies that have ...

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

You can watch comet 3I/ATLAS live online tonight (July 3), thanks to the Virtual Telescope Project, which will livestream ...

Interstellar object headed towards Mars, but poses no threat to Earth, says head of planetary defence at the ESA.