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KENNEDY SPACE CENTER, FLA. -- Smoke and steam billow across Launch Pad 39A as Space Shuttle Atlantis, trailing columns of fire from the solid rocket boosters, hurtles into the sky on mission STS-117 to the International Space Station. At left is the fixed service structure with the 80-foot-tall lightning mast on top. Liftoff was on-time at 7:38:04 p.m. EDT. The shuttle is delivering a new segment to the starboard side of the International Space Station's backbone, known as the truss. Three spacewalks are planned to install the S3/S4 truss segment, deploy a set of solar arrays and prepare them for operation. STS-117 is the 118th space shuttle flight, the 21st flight to the station, the 28th flight for Atlantis and the first of four flights planned for 2007. Photo Credit: NASA/Tony Gray & Don Kight