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 ...

The research is mounting up that we might not be alone in this big wide world. So what's the likelihood that aliens are out ...

Senior figures from inside the U.S. military and intelligence world are now openly suggesting that the government has encountered technology and even “biologics” that are not human, even as official ...

The unusual specimen raised eyebrows because it appeared capable of causing levitation. An official investigation has not ...

Scientists searched 27 exoplanets for alien technology using planetary eclipses, revealing a new way SETI hunts signals ...

A Harvard astronomer is making waves by suggesting that a massive interstellar object hurtling through our solar system might be an alien spacecraft. Professor Avi Loeb, who also serves as director of ...