Speed and Agility: The slow-moving Sojourner crept along at just one centimeter a second, that's less than two feet (0.6 meters) per minute. But what Sojourner lacked in speed, it made up for in agility. Though it had only five inches of ground clearance, the rover was designed to climb up and over the obstacles it encountered in the rocky Martian valley where Pathfinder landed.
Equipped with six wheels that could move independently, Sojourner could crawl straight up somebody's leg. It could lean up to 60 degrees to either side without tipping over. Its wheels were able to dig down into the surface of the planet to gather information about the Martian soil.
Range: Sojourner could staty in touch with the lander up to 300 feet away. For the first week, it only traveled about 30 feet (10 meters) from the lander.
Operation: Scientists "drove" the rover from 120 million miles away using a computer screen, a joy stick, and three-dimensional goggles. While driving the rover was much like steering a remote control car, scientists experienced an 11 minute lag before the rover responded to their commands.
Size: 22 pounds, 25 inches long, 19 inches wide, and 10 inches high.
Fuel: Though both the rover and the lander had batteries on board, they relied heavily on solar energy to power the mission. That meant most of their activity took place during the Martian day.