The Mars Exploration Rover Spirit drove itself 1 meter (3 feet) out of 6.4 meters (21 feet) at Gusev Crater, Mars, on Feb. 8, 2004, the 36th sol of its mission. This image shows the tracks it created in the martian soil as it drove straight ahead, then to the left. The rover also drove over Adirondack (seen in image bottom center), the bright rock that was targeted by Spirit's rock abrasion tool, on its way to a rock target called White Boat. This was the first test of the rover's autonomous system, which will be used many times in the days to come.