NASA chief confirms agency has unexplained UFO imagery
Digest more
Previous landmark scientific discoveries like the Higgs boson provide a better template for what it will take to confirm whether aliens have made contact with Earth.
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.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results