FILE - This Sept. 16, 2010 file photo shows engineers working on the Mars rover Curiosity at NASA's Jet Propulsion Laboratory in Pasadena, Calif. 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/Jae C. Hong, file)

Associated Press
FILE - This Sept. 16, 2010 file photo shows engineers working on the Mars rover Curiosity at NASA's Jet Propulsion Laboratory in Pasadena, Calif. 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/Jae C. Hong, file)
FILE - This Sept. 16, 2010 file photo shows engineers working on the Mars rover Curiosity at NASA's Jet Propulsion Laboratory in Pasadena, Calif. 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/Jae C. Hong, file)
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