There's no end to the earthly items that Red Planet UFO enthusiasts have “discovered” on Mars – a snake , a coffin , traffic light , cat , lizard , even a sasquatch , just to name a few. But, as Live Science reports, one rock that has piqued scientists' interest is a unusual dark-gray object that seems out of place with the rest of the reddish rock and dirt spread across the Martian landscape.
