Mars exploration rover Opportunity gets ready for some more examination as it comes up to this flat-faced rock (center of the picture) on the red planet. Opportunity rover’s wide-angle, front hazard avoidance camera took this picture in early March 2015, on the 3,948th Martian day of the rover’s mission on Mars. This rock is located in an area dubbed “Marathon Valley” which the rover reached over the last month and plans to study for its unique mineral characteristics.