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.

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

Earlier this year, President Trump directed agencies to begin the process of identifying and releasing files related to alien and extraterrestrial life. The first files were released May 8 at ...