Michael Watkins, MSl mission manager, Jet Propulsion Laboratory, adjusts a model of Curiosity's mast during a news briefing at NASA's JPL in Pasadena, Calif., Tuesday, Aug. 7, 2012. The arm and the remote sensing mast of the Mars rover Curiosity each carry cameras, science instruments and other tools for NASA's Mars Science Laboratory mission.(AP Photo/Damian Dovarganes)

Associated Press
Michael Watkins, MSl mission manager, Jet Propulsion Laboratory, adjusts a model of Curiosity's mast during a news briefing at NASA's JPL in Pasadena, Calif., Tuesday, Aug. 7, 2012. The arm and the remote sensing mast of the Mars rover Curiosity each carry cameras, science instruments and other tools for NASA's Mars Science Laboratory mission.(AP Photo/Damian Dovarganes)
Michael Watkins, MSl mission manager, Jet Propulsion Laboratory, adjusts a model of Curiosity's mast during a news briefing at NASA's JPL in Pasadena, Calif., Tuesday, Aug. 7, 2012. The arm and the remote sensing mast of the Mars rover Curiosity each carry cameras, science instruments and other tools for NASA's Mars Science Laboratory mission.(AP Photo/Damian Dovarganes)
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