ocr: U9 O A The Sojourner or "micro-rover" ROBOTS The Sojourner rover was launched aboard the. Mars MARTIAN ROVERS Pathfinder on December 5, 1996, and is scheduled to land on the Red Planet in early July 1997. Unlike the Viking landers, the Sojourner will be the first mobile vehicle to explore the Martian surface. After landing, the pyramid- shaped Pathfinder will be stabilized, then the sides will open like the petals of a flower to free the six-wheeled Sojourner. Equipped with solar panels, the 60-centimeter long vehicle has a traveling speed of 60 centimeters per minute (36 meters per hour). It ...