In this July 25, 2012 photo, Rob Manning, chief engineer, speaks to media at NASA Mars Yard at NASA's Jet Propulsion Laboratory in Pasadena Wednesday, July 25, 2012. Beside Manning is a model of the Mars rover, Curiosity. After traveling 8 1/2 months and 352 million miles, Curiosity will attempt a landing on Mars the night of Aug. 5, 2012. (AP Photo/Nick Ut)

Associated Press
In this July  25, 2012 photo, Rob Manning, chief engineer, speaks to media at NASA Mars Yard at NASA's Jet Propulsion Laboratory in Pasadena Wednesday, July 25,  2012. Beside Manning is a model of the Mars rover, Curiosity. After traveling 8 1/2 months and 352 million miles, Curiosity will attempt a landing on Mars the night of Aug. 5, 2012. (AP Photo/Nick Ut)
In this July 25, 2012 photo, Rob Manning, chief engineer, speaks to media at NASA Mars Yard at NASA's Jet Propulsion Laboratory in Pasadena Wednesday, July 25, 2012. Beside Manning is a model of the Mars rover, Curiosity. After traveling 8 1/2 months and 352 million miles, Curiosity will attempt a landing on Mars the night of Aug. 5, 2012. (AP Photo/Nick Ut)
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