... Credit Copyright: Mars Exploration Rover Mission , JPL , NASA Explanation: What if you saw your shadow on Mars and it wasn't human ? Then you might be the Opportunity rover currently exploring Mars. Opportunity and sister robot Spirit have been probing the red planet since January, finding evidence of ancient water , and sending breathtaking images across the inner Solar System . Pictured above , Opportunity looks opposite the Sun into Endurance Crater and sees its own shadow . ...