A mysterious metal shard, once thought to be a piece of a UFO that crashed in 1947, has sparked years of wild speculation.

From mudstones on Mars to strange gases in exoplanet atmospheres, tentative evidence for extraterrestrial life is starting to ...

One of Britain’s most prominent space scientists believes humanity may finally get an answer to one of its oldest questions ...

Astronomers thought they had seen the "first hints of life on an alien world" this year, but they disappeared under closer ...

Is it the invasion of the genome snatchers? Just in case the idea of aliens walking around in human skin suits wasn’t frightening enough. An outlandish study asserts that aliens might have abducted us ...