Opportunity rover's lander on Mars. Fisheye lens view from the rear of the Mars Exploration Rover Opportunity after it left its lander, showing the lander on the Martian surface. Opportunity rolled down the lander's ramp (hatched) onto the Martian surface on 31 January 2004. Wheel tracks show the path taken by Opportunity, and one of its wheels is at lower right. Opportunity landed in a small crater in the Meridiani Planum region of Mars on 24 January 2004. Opportunity and an identical rover called Spirit will study Martian rocks and look for water on the planet. This picture was taken by Opportunity's rear hazard-identification camera.