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.

A former CIA-linked physicist's comments about 'four alien species' have reignited UFO conspiracy theories online.

The White House will begin releasing a first batch of so‑called 'alien files' in Washington on Friday, according to a senior US Congressman, in a move that believers say could mark the start of ...

Neil deGrasse Tyson used a Monday appearance on 'The Fox News Rundown' in the US to throw down a blunt challenge after the ...