NASA Associate Administrator for Space Operations Bill Gerstenmaier, left, NASA Administrator Charles Bolden, center, and NASA Associate Administrator Chris Scolese monitor the launch countdown of the space shuttle Discovery and the start of the STS-131 mission from the Launch Control Center at NASA Kennedy Space Center in Cape Canaveral, Fla. on Monday April 5, 2010. Discovery is carrying a multi-purpose logistics module filled with science racks for the laboratories aboard the station. The mission has three planned spacewalks, with work to include replacing an ammonia tank assembly, retrieving a Japanese experiment from the station's exterior, and switching out a rate gyro assembly on the S0 segment of the station's truss structure. Photo Credit: NASA/Bill Ingalls
