Nearly obscured by its contrail Space Shuttle Atlantis hurtles toward space for a rendezvous with the International Space Station on STS-115.

Nearly obscured by its own contrail, Space Shuttle Atlantis hurtles toward space for a rendezvous with the International Space Station on mission STS-115. Liftoff was on-time at 11:14:55 a.m. EDT. After launch attempts were scrubbed Aug. 27 and 29 and Sept. 3 and 8 due to weather and technical concerns, this launch was executed perfectly. Mission STS-115 is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the International Space Station. During the mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Ken Thornsley