Space Shuttle Discovery, atop the mobile launcher platform and moved by the crawler-transporter underneath, makes its final approach up the ramp to Launch Pad 39B for launch of mission STS-116. The mission is No. 20 to the International Space Station and construction flight 12A.1. The mission payload is the SPACEHAB module, the P5 integrated truss structure and other key components. The launch window for mission STS-116 opens Dec. 7. Photo credit: NASA/Amanda Diller