August 4, 2012
In this Thursday, Aug. 2, 2012 file photo, Adam Steltzner, Mars Science Laboratory's entry, descent and landing phase leader at NASA's Jet Propulsion Laboratory, uses a scale model to explain the Curiosity rover's path to the surface during a news conference at the laboratory, in Pasadena, Calif. The rover is headed for a two-year mission to study whether Mars ever had the elements needed for microbial life.
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