NASA Mars Rover Opportunity Image: Very Small Crater?
Right Navigation Camera Non-linearized Full frame EDR acquired on Sol 433 of Opportunity’s mission to Meridiani Planum at approximately 16:31:41 Mars local solar time. NASA/JPL
NASA Photo link: http://marsrovers.jpl.nasa.gov/gallery/all/1/n/433/1N166636311EFF5400P0703R0M1.JPG