If you were hoping we’d find alien life hanging out on a cozy, pint-sized planet anytime soon, then you should know that ...

When scientists search for life beyond Earth, Mars usually gets most of the attention. But another world may offer an even ...

The nature of space, time and the evolution of life on Earth mean it’s unlikely extraterrestrial life has visited our home planet.

A Durham University survey reveals 86% of astrobiologists believe alien life likely exists, despite no confirmed evidence.

For a world to maintain an atmosphere long enough for life to gain a foothold, it seems it needs to be at least as big as ...

Alien civilizations may have left traces. We just may not have been looking in the right place.

Many have watched recently released UFO videos, but most still think the government knows more than it is saying.

LOS ANGELES (AP) — In "Disclosure Day," out Friday, Steven Spielberg is once again inviting audiences to ponder the existence of extraterrestrial life — and the implications it would have for religion ...