Weirdly Interesting A 'Cannonball' On Mars Has Alien Hunters Excited  

Rebecca High

This video shot by NASA's Curiosity rover shows something shocking on the ruddy-red surface of Mars. 

A small sphere that looks uncannily like an ancient cannonball has turned up on the surface of the Red Planet, with seemingly no explanation.

UFO hunter Scott C. Waring thinks this is a cannonball projected from outside Mars' natural atmospheric shield, indicating that there must have once been a giant war that decimated Mars' population. NASA, however, claims it's a rock that became round through a mineral process involving internal water evaporation not unlike how ocean stones on Earth become smooth through continuous movement.

Either way, Curiosity has captured a pretty cool video, putting all those government dollars (and our imaginations) to work.