Mars Rock Mystery: Sudden Appearance Of A 'Jelly Doughnut' Rock Leaves Researchers 'Completely Confused'

Much like "Mars Rat," a Martian rock is causing quite the stir. Captured by NASA's Opportunity Mars Rover, researchers discussed a rock that appeared in an image that was not there previously. The Mars rock mystery quickly went viral and speculation ranges from Opportunity knocking the rock into the frame to, naturally, aliens.