Twin columns of fire propel space shuttle Discovery past the lightning mast on Launch Pad 39A toward space on mission STS-119.

At NASA's Kennedy Space Center in Florida, twin columns of fire propel space shuttle Discovery past the lightning mast on Launch Pad 39A toward space on mission STS-119. 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 courtesy of Scott Andrews