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Nasa's Curiosity Rover has captured images of a perfectly formed pyramid on Mars and conspiracy theorists reckon it's proof of an alien civilization.

The pyramid is thought to be about the size of a car, and most people believe it's nothing more than a coincidental rock formation.

However, the YouTube channel ParanormalCrucible goes further, insisting the "near perfect design and shape" means the pyramid is: "the result of intelligent design and certainly not a trick of light and shadow".

Other outlandish theories suggest the pyramid is simply the tip of a larger structure buried underground.

Some viewers pointed out that the mysterious pyramid could have been formed by wind.

This isn't the first time that conspiracy fans have seized on images from Mars as evidence that not all is what it seems.

Earlier this year pictures emerged reportedly showing a mushroom cloud and the shadow of a workman on the Red Planet.

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