Donald Trump's declassified UFO files and the documentary Sleeping Dog reignite the debate on extraterrestrial life, yet officials maintain no evidence confirms alien existence.

Unidentified aerial phenomena (UAPs) have resurfaced at the centre of online discussion after a widely shared interview revisited reports of supposed 'non-human' life linked to recovered unidentified ...

Online claims linking Tree to UAP activity and alien bases have circulated amid investigation following his death ...

Add Yahoo as a preferred source to see more of our stories on Google. Photo by Michael Loccisano/Getty Images for Webby Awards Neil deGrasse Tyson, who for years has laughed off and shot down ...

Neil deGrasse Tyson, who for years has laughed off and shot down questions about UAP and aliens, is ready to talk at length about the phenomenon - and wants to see some real proof after the latest ...