This image mosaic, taken by the navigation camera on NASA's Mars Exploration Rover Opportunity, shows the impact crater known as "Endurance." The rover has been traversing the rim of the crater looking for clues to the crater's formation as well as a suitable entry point to the crater. The image was taken on sol 116 of the rover's journey (May 1, 2004), from "Panoramic Position 2" on the southeast side of the crater.