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Mars Exploration Rovers

Mars Exploration Rovers (Spirit and Opportunity)

Spirit Launch: Jun. 10, 2003; Mars Landing: Jan. 3, 2004
Opportunity Launch: Jul. 7, 2003; Mars Landing: Jan. 24, 2004

Two powerful Mars rovers are on the red planet. They have far greater mobility than the 1997 Mars Pathfinder rover. Each rover carries a sophisticated set of instruments to search for evidence of liquid water that may have been present in the planet's past. The rovers are identical to each other, but are exploring different regions of Mars.

- NASA, http://www.nasa.gov/mission_pages/mer/index.html