Principal Investigator Steve Squyres, center, reacts as NASA Chief Sean O'Keefe, left, looks on at NASA's Jet Propulsion Laboratory as the get a signal from the Mars Rover Spirit after it landed, Saturday, Jan. 3, 2004, in Pasadena, Calif. The NASA rover plunged through the atmosphere of Mars and bounced down upon its rocky surface Saturday night, beginning a mission to roam the Red Planet in search of evidence that it was once suitable for life. (AP Photo/pool/Los Angeles Times, Wally Skalij)
