CAPE CANAVERAL, Fla. – On Launch Pad 39A at NASA's Kennedy Space Center in Florida, the fiery exhaust from liftoff of space shuttle Discovery lights up the evening sky. Launch on mission STS-119 was on time at 7:43 p.m. EDT. The STS-119 mission is the 28th to the space station and Discovery's 36th flight. Discovery will deliver the final pair of power-generating solar array wings and the S6 truss segment. Installation of S6 will signal the station's readiness to house a six-member crew for conducting increased science. Photo credit: NASA/Tony Gray, Tom Farrar

CAPE CANAVERAL, Fla. – From Launch Pad 39A at NASA's Kennedy Space Center in Florida, space shuttle Discovery races toward space atop towers of flame. Clouds of smoke and steam engulf the pad below. Launch on mission STS-119 was on time at 7:43 p.m. EDT. The STS-119 mission is the 28th to the space station and Discovery's 36th flight. Discovery will deliver the final pair of power-generating solar array wings and the S6 truss segment. Installation of S6 will signal the station's readiness to house a six-member crew for conducting increased science. Photo credit: NASA/Tony Gray, Tom Farrar

CAPE CANAVERAL, Fla. – In Firing Room 4 of the Launch Control Center at NASA's Kennedy Space Center in Florida, Deputy Director of NASA's Stennis Space Center Patrick Scheuermann and Mission Management Chair Mike Moses go through the tie-cutting ritual after working their first shuttle launch. Space shuttle Discovery lifted off on time at 7:43 p.m. EDT. The STS-119 mission is the 28th to the space station and Discovery's 36th flight. Discovery will deliver the final pair of power-generating solar array wings and the S6 truss segment. Installation of S6 will signal the station's readiness to house a six-member crew for conducting increased science. Photo credit: NASA/Kim Shiflett