A pyramid seen on the surface of Mars is conclusive proof that aliens live on the Red Planet, UFO fans claim.
The buiding (or rock) was seen in NASA footage from the surface, and has been seized on as evidence that there is a secret civilisation on Mars.
Many UFO fans believe that NASA has been covering up life on Mars for decades - with some even believing that Man landed safely there in 1968 and that we have been living there ever since.
The strange formation was shown off in a YouTube show ‘Paranormal Crucible’.
The presenters claim that the rock’s ‘near perfect design and shape’ mean it must be ‘the result of intelligent design and certainly not a trick of light and shadow.’
Other, more sceptical observers suggest that the formation may just be a rock - and only knee-high at most.
Previousy, conspiracy theorists have picked out coffins, guns and alien faces on Mars - and on one memorable occasion, a buxom female robot walking on the surface.
'The vast majority of these images are as vague and elusive as those posted by UFO witnesses on Earth, and many have a fairly mundane explanation,' said Nigel Watson author of the UFO investigations Manual.
'The problem is that the more Nasa denies such things or explains them, the more people think there is a conspiracy to hide the truth that aliens are visiting our planet.'