The first wheeled vehicle to land on Mars was during NASA's 1997 Mars Pathfindermission, which consisted of a stationary lander and a surface rover called Sojourner.
With the first week on Mars behind them, the scientists and engineers who put Pathfinder on the Red Planet say they have already met the major objectives set for the mission.
The mission has also been a public relations triumph, with more than 150 million hits on the Pathfinder's World Wide Web sites in the first week alone.