This animation is created from still images taken by the Mars Exploration Rover Spirit during its approximately 21.2-meter (69.6-foot) drive across the pebbly ground at Gusev Crater, Mars, on the 37th day, or sol, of its mission (Feb. 9, 2004). Two sols later, Spirit drove another 24 meters (78.7 feet) toward a rock target called White Boat. The images were captured by the rover's front hazard-avoidance camera after it began the autonomous portion of its drive.