NASA's twin robot geologists, the Mars Exploration Rovers, Spirit and Opportunity, launched from Earth on June 10 and July 7, 2003. Their mission was to search of answers about the history of water on Mars. They landed on Mars January 3 and January 24 PST, 2004.
As geologists, the rovers are have goals of searching for and characterizing a wide range of rocks and soils that hold clues to past water activity on Mars. The twins wwere sent to sites on opposite sides of Mars that appear to have been affected by liquid water in the past.
Here are some fascinating images sent back by the Mars Rover, Spirit.
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