Liftoff of Discovery from Launch Pad 39A at NASA's Kennedy Space Center lights up the evening sky.

Liftoff of space shuttle Discovery from Launch Pad 39A at NASA's Kennedy Space Center in Florida lights up the evening sky as it begins the STS-119 mission. The launch was on time at 7:43 p.m. EDT. The STS-119 mission is the 28th to the International Space Station and the 125th space shuttle 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/Sandra Joseph, Kevin O'Connell