NASA's Mars Exploration Rover Opportunity climbed out of "Endurance Crater" during the rover's 315th sol (Dec. 12, 2004), and used its rear hazard-avoidance camera to look out across the plains south of the crater. After Opportunity examines the nearby heat shield that protected it during its descent through Mars' atmosphere, the rover team plans to drive the rover south to a rugged region described as etched terrain.