NASA's Mars Exploration Rover Opportunity looks back out at the plains of Meridiani Planum from the rover's first dip inside the rim of 'Endurance Crater.' Opportunity's rear hazard-avoidance camera took this picture on June 8, 2004.

NASA's Mars Exploration Rover Opportunity looks back out at the plains of Meridiani Planum from the rover's first dip inside the rim of "Endurance Crater." Opportunity's rear hazard-avoidance camera took this picture during the rover's 133rd martian day, or sol, on June 8, 2004.

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