Two months ago, scientists detected an unusual object entering our Solar System, sparking speculation about whether it is a ...

The astrophysicist has authored a new book about the prospect of nonhuman intelligence in the universe.

Why do we tend to assume that UFOs are crafts carrying alien beings rather than alien beings themselves? How the UFO ...

Scientists are watching a newly discovered object in space, and most of them agree it's a comet, but not all of them. A Harvard scientist, who believes he's seen proof of alien life before, suspects ...