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In theory, a Mars Rover could be any size desired. However, there are limits to the size and mass of objects launched from Earth and designed to be hard-landed on the surface.

The original Mars rover, Pathfinder, was about 2 feet long. The two Mars rovers currently active, Opportunity and Spirit, are about 5 feet tall, and 6 feet long and wide. On Earth, each would weigh about 385 pounds, but on Mars they weigh less than 100.

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15y ago

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