Disclosing government documents about UFOs won't mean much without hard physical evidence for alien spaceships or alien bodies.

President Donald Trump has promised to declassify top-secret alien files and UFO documents. Here is what the Pentagon has ...

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

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 ...

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 ...

Former President Barack Obama said he did not see evidence that aliens “have made contact with us,” after sending social ...

If you found out we weren't alone, if someone showed you, proved it to you, would that frighten you? That question sits at the heart of Disclosure Day, Spielberg’s new film. Here are 10 movies that ...

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

For more than six decades, astronomers have listened for possible signals from extraterrestrial civilisations, with no confirmed detection to date. A .