UFO enthusiasts claim they have found indisputable evidence that a war has taken place on Mars.
A baffling video has emerged showing what looks like a cannonball on the surface of the Red Planet, which has been seized on as proof as life.
The clip was posted on YouTube, where stargazers have been guessing what it could be.
UFO hunter Scott C. Waring wrote on UFO Sightings Daily that the ball appeared to be surrounded by 'the fragments of a once civilisation'.
He speculated that this civilisation could have been wiped out by weapons fired down from space.