Pete Theisinger (L), Mars Science Laboratory project manager from NASA's Jet Propulsion Lab, looks on as Adam Steltzner, Mars Science Laboratory, entry, descent and landing phase lead from NASA's Jet Propulsion Lab, speaks during a news conference at JPL in Pasadena, Calfiornia August 2, 2012. Seen in the background is a graphic of the MSL Curiousity rover descending from a sky crane as it prepares to land on Mars, August 5, 2012. REUTERS/Fred Prouser (UNITED STATES - Tags: SCIENCE TECHNOLOGY)