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.
For more information about the topic Mars Exploration Rover, read the full article at Wikipedia.org, or see the following related articles:
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