UFO

Nasa to publish long-awaited UFO report

No evidence of space aliens so far in the Pentagon's UFO deep-dive

Nasa to launch UFO study

Mysterious blue UFO video from Hawaii making waves on Twitter

Strange metal object from Utah desert inspires '2001: A Space Odyssey' comparisons

What would aliens think?

First time ever, Pentagon releases 'unidentified aerial phenomena' videos

Area 51 is no joke