Sojourner (rover)
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The Sojourner rover was a vehicle that reached Mars on July 4, 1997 as part of the Mars Pathfinder mission. Sojourner was operational on Mars for 92 sols, and was the first wheeled vehicle to operate
Sojourner rover pictured by Pathfinder lander
Sojourner at JPL
Schematic representation of the lander
Schematic representation of the rover
Spirit (rover)
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Spirit, also known as MER-A or MER-2, is a Mars robotic rover, active from 2004 to 2010. Spirit was operational on Mars for 2208 sols or 3.3 Martian years. It was one of two rovers of NASA's Mars Expl
Sojourner (rover)
…Mars—being very stable, and allowing forward and backward movements with similar ease—and was adopted with appropriate precautions in the subsequent Spirit and Opportunity rover missions. In the ten-year development phase that led to the realization of Sojourner, alternative solutions that could take…
The Mars Exploration Rover-2 (MER-2) during testing for mobility and maneuverability
Delta II lifting off with MER-A on June 10, 2003
Annotated Columbia Hills panorama from the Spirit landing site
An overall view of MER-A Spirit landing site (denoted with a star)