Jeff Norris, manager of the Planning and Execution Systems Section at the NASA Jet Propulsion Laboratory, explains the new "Mars Rover Landing " game for Xbox Live which simulates the landing of Mars Science Laboratory on Mars at NASA's Jet Propulsion Lab in Pasadena, Calfiornia August 5, 2012. The Mars Science Lab Curiosity rover is set to land in the late evening of August 5, 2012. REUTERS/Fred Prouser (UNITED STATES - Tags: SCIENCE TECHNOLOGY)