On Launch Pad 39A at NASA's Kennedy Space Center Discovery's doors are being closed.

On Launch Pad 39A at NASA's Kennedy Space Center in Florida, space shuttle Discovery's payload bay doors are being closed. A worker checks the progress of the doors. The cargo consists of the integrated truss structure S6 and solar arrays for the STS-119 mission to the International Space Station. During Discovery's 14-day mission, the shuttle's seven astronauts will install the S6 truss to the starboard side of the space station, completing the station's truss, or backbone. Launch of Discovery on the STS-119 mission is targeted for Feb. 12. Photo credit: NASA/Dimitri Gerondidakis