Just months after 9/11, strange messages started appearing across U.S. military computers: “Your security system is crap.” ...

Scientists are raising concerns that we may be overlooking evidence of extraterrestrial life even when it is present. Hidden ...

For the last decade Harvard astronomer Avi Loeb has been scanning the skies and seas for evidence of intelligent alien life.

Steven Spielberg's new blockbuster coincides with real-world disclosures about the government's investigation of unidentified phenomena. But there's no proof of aliens yet.

The SETI Institute is the latest to confirm what scientists have long suspected: the interstellar 3I/ATLAS comet is not an alien spaceship.