Onlookers watch as Scarecrow, a mobility-testing model for NASA's Mars Science Laboratory, easily conquers boulders in the Mars Yard testing area at NASA's Jet Propulsion Laboratory.

Onlookers watch as Scarecrow, a mobility-testing model for NASA's Mars Science Laboratory, easily conquers boulders in the Mars Yard testing area at NASA's Jet Propulsion Laboratory.

The Mars Science Laboratory rover is in development for launch in 2009. JPL, a division of the California Institute of Technology, Pasadena, manages the mission for the NASA Science Mission Directorate, Washington.

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