A recent study has renewed discussion about whether advanced extraterrestrial civilisations could leave detectable ...

Billions of years ago, while the solar system was still young, a massive object may have drifted into it. It's not a spaceship, but it is an alien visitor in its own right—a colossal interstellar body ...

One million alien visitors from another star system could already be lurking in the solar system. We aren't talking about "little green men" here, however — more "little (and not so little) gray rocks ...

From the Wow! Signal and mysterious UFO footage to Europa, Enceladus, and Titan, scientists have spent decades evaluating the ...

Add Yahoo as a preferred source to see more of our stories on Google. A deep image of interstellar Comet 3I/ATLAS captured by the Gemini Multi-Object Spectrograph (GMOS) on Gemini South at Cerro ...

There may be 19 asteroids in orbit around the sun that come from somewhere else entirely. If true, we could visit an alien 'world' without ever leaving the confines of the solar system. Share on ...

A JUPITER-SIZED planet has been spotted in a large circular orbit around its parent star, in the most similar solar system to our own yet seen. Although Earth-sized planets are too small to be ...

Strange interstellar comet speculated to be alien spacecraft is older than Solar System - Scientists say comet represents preserved fragment of ancient planetary system ...