On Launch Pad 39A one of space shuttle Discovery's payload bay doors is closed.

On Launch Pad 39A, one of space shuttle Discovery's payload bay doors is closed. Inside can still be seen the payloads, the U.S. Node 2, named Harmony (lower), and orbital docking system (upper). Mission STS-120 will bring the Harmony module that will provide attachment points for European and Japanese laboratory modules to the International Space Station. Launch of Discovery is targeted for Oct. 23. Photo credit: NASA/George Shelton