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Associated Press
In this photo provided by NASA, Mars Science Laboratory (MSL) Flight Systems Chief Engineer Rob Manning, left, smiles as he watches MSL Flight Director Keith Comeaux move the final marble from a jar marked "Days Until Entry" to the jar marked "Days Since Launch" at the Jet Propulsion Laboratory on Sunday, Aug. 5, 2012 in Pasadena, Calif. The MSL Rover named Curiosity was designed to assess whether Mars ever had an environment able to support small life forms called microbes. Curiosity is due to land on Mars at 10:31 p.m. PDT on Aug. 5, 2012. (AP Photo/NASA, Bill Ingalls)

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