PASADENA, CA – AUGUST 5: In this handout image provided by NASA, the Mars Science Laboratory (MSL) team clap and welcome White House Science and Technology Advisor John Holdren (3rd L), as he stops by to meet the landing team and to say “Go Curiosity” as NASA Administrator Charles Bolden (2nd L) and Jet Propulsion Laboratory Director Charles Elachi (L) look on, August 5, 2012 at JPL in Pasadena, California. The MSL Rover named Curiosity was designed to assess whether Mars ever had an environment able to support small life forms called microbes. Curiosity is due to land on Mars at 10:31 p.m. PDT today (1:31 a.m. EDT on Aug. 6, 2012). (Photo by Bill Ingalls/NASA via Getty Images)
