The US space agency NASA has found evidence of alien civilizations elsewhere in the universe. 

But if you're thinking to yourself, "I really should have heard about this before now," you're absolutely right.

The outlandish claim was made in a video by shadowy hacker group Anonymous and uploaded to an unofficial channel on Youtube. 

The 12-minute video features a man wearing the obligatory Guy Fawkes mask talking about alien lifeforms.

With his voice digitally distorted, the man cites NASA's associate administrator Thomas Zurbuchen who spoke at a congressional hearing on "Advances in the Search for Life" in April.

Zurbuchen said "we are on the verge of making one of the most profound, unprecedented discoveries in history."

But he never publicly elaborated on what exactly the discoveries were and when they would be made public. 

A screenshot from the video recently uploaded to Youtube. /YouTube Screenshot

The video goes on to say that recent discoveries such as the presence of hydrogen in Saturn’s moon and oceans found on one of the moons of Jupiter point towards the possibility of man encountering life not native to Earth. 

As of Monday evening, the Youtube video had been viewed more than a million times and sparked lively debate. 

The most upvoted comments express disappointment. One user named "Amy Estep-Lake" asked "Does anyone actually think or believe we are alone in this universe?"

While "Ed Asbury" quipped "I would be more astonished if they found intelligence here on Earth."

Some people even used the video as an opportunity to troll US President Donald Trump, saying "We're gonna build a space wall and the aliens will pay for it!"

But despite the jokes, many seriously doubted the authenticity of the video with the user "Wait! What?" saying "If you all aren't right, I've lost faith in Anonymous." 

Perhaps unsurprisingly, NASA have yet to comment.