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Mars Exploration Rover

NASA's Mars Exploration Rover (MER) Mission is an unmanned Mars exploration mission that sent two robotic rovers Spirit and Opportunity to explore the Martian surface and geology.

Primary among the mission's scientific goals is to search for and characterize a wide range of rocks and soils that hold clues to past water activity on Mars.

Note:   The above text is excerpted from the Wikipedia article "Mars Exploration Rover", which has been released under the GNU Free Documentation License.
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