Sojourner
NASA's 11 kg Mars rover (1997), the first wheeled vehicle to operate autonomously on another planet, demonstrating robotic planetary exploration.
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Sojourner Rover Lands on Mars as First Autonomous Wheeled Vehicle on Another Planet
On 4 July 1997, NASA's Sojourner rover became the first wheeled vehicle to operate on another planet, driving onto the Martian surface as part of the Mars Pathfinder mission. Sojourner used onboard hazard-avoidance logic and laser stripe sensors to navigate autonomously when out of direct communication with Earth.