Scientists propose that a moon base could act as an isolated first line of biological defense against extraterrestrial ...

Scientists are listening in on sperm whale conversations and studying Earth's strangest microbes to prepare humanity for ...

To travel between solar systems, a spacecraft would need extremely sophisticated – if not impossible – technology.

The Pentagon's release of files might help scientists shed light on unexplained phenomena and government secrets, experts said.

Steven Spielberg discusses his new UFO film "Disclosure Day" on Michelle Obama's podcast, saying it explores whether aliens have already reached Earth.