Fuel for alien life conspiracy theories

Conspiracy theories involving extraterrestrial life and UFO sightings predate the rise of the internet -- but social media has definitely played a role in spreading fodder for such theories. Watch below for some of the most convincing UFO sightings out there and more extraterrestrial curiosities.

Alien Enthusiasts Spot A 'Cross' On Mars

A UFO hunter in France recently claims to have spotted a 'cross' on Mars.

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