It wasn’t there before!

Mystery ‘doughnut’ materializes in front of Mars rover

Scientists at NASA’s Jet Propulsion Laboratory are puzzled by a mysterious rock that has appeared in front of the Opportunity rover, Curiosity’s never-say-die older sibling.

“Mars keeps throwing new stuff at us!” NASA Mars Exploration Rover lead scientist Steve Squyres told Discovery News.

Read the full article at The Register…