Awaiting Commands Three generations of Mars rovers, seen at JPL's test site. The small one is the first Mars rover, Sojourner, which landed on Mars in 1997. On the left is a Mars Exploration Rover Project test rover that is a working sibling to Spirit and Opportunity, which landed on Mars in 2004. On the right is a Mars Science Laboratory test rover the size of Curiosity, which is on course for landing on Mars in August.NASA/JPL-Caltech



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