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From alien hands to Donald Trump's face, conspiracy theorists claim to have spotted a range of weird and wonderful objects on Mars.
Now, alien hunters believe they have spotted a metal cannonball on the surface of the red planet in an image taken by Nasa's Curiosity Rover.
Conspiracy - Theorists - Object - Evidence - War
Conspiracy theorists claim the object is evidence of a past war on Mars - although it is likely to simply be a rock.
A video posted on YouTube by channel WhatsUpInTheSky37 shows an image taken by Nasa's Curiosity Rover of Mars' surface.
Video - Image - 'ball - Look - Grey
In the video, the image has been colour enhanced to make the 'ball' look grey against the red rocks.
Commenting on the video, Scott C. Waring, who runs the site UFO Sightings Daily, said: 'This metal ball is perfectly formed and about the size of a softball here on Earth.
Size - Cannon - Ball
'Guess what? That also matches the size of a cannon ball.'
Mr Waring suggests that the object is '100 per cent evidence of a war on Mars.'
'This - Projectile - Surface - Stone
He added: 'This projectile is sitting on the surface above all the wrecked stone structures around it.
'Fragments of a once civilisation is sitting scattered in...
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