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

Human intelligence wasn’t a cosmic evolutionary fluke, some scientists say. The case against cosmic loneliness is growing.

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 ...

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

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

More than 2,500 alien plant species could find suitable conditions in the Arctic, especially in northern Norway and Svalbard.

Human activity brings with it alien species and creates excellent conditions that allow them to become established in an otherwise barren Arctic landscape. (Kristine Bakke Westergaard, NTNU via SWNS) ...

Nasa reinforces its commitment to open science following Donald Trump's interest in declassifying alien files. The agency ...