How big would a telescope need to be to see Earth’s dinosaurs from 66 million light-years away? Think big—and then think ...

The question of whether aliens exist is not a new one. In science fiction films and books, people have wondered if we’re the only life in this universe and what that can imply for universes beyond ...

On Thursday the U.S. president ordered the release of federal files related to UFOs and aliens, although no evidence of extraterrestrials visiting Earth is known to exist ...

For more than a century, popular culture has trained us to picture extraterrestrials as bug-eyed, bipedal “little green men” who look suspiciously like us in rubber suits. The scientists who actually ...

There are things the NASA chief has "come across in the job that he can’t explain," but aliens are not among them.