Associated Press
FILE - In this file photo taken Thursday, Aug., 2012, Adam Steltzner, Mars Science Laboratory's entry, descent and landing phase leader at JPL uses a scale model to explains the Curiosity rover's Entry, Descent, and Landing (EDL) during the Mission Engineering Overview news briefing at NASA's Jet Propulsion Laboratory in Pasadena, Calif.  Curiosity is scheduled to land on Mars Sunday night, Aug. 5, 2012. (AP Photo/Damian Dovarganes, File)

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