Before getting on the Astrovan for the ride to Launch Pad 39A at NASA's Kennedy Space Center.

Before getting on the Astrovan for the ride to Launch Pad 39A at NASA's Kennedy Space Center, the STS-120 crew pauses to wave to spectators. From left are Mission Specialists Paolo Nespoli, Scott Parazynski, Daniel Tani, Doug Wheelock and Stepahnie Wilson, Pilot George Zamka and Commander Pamela Melroy. Space shuttle Discovery is scheduled for liftoff at 11:38 a.m. EDT. The mission will be the 23rd assembly flight to the space station and the 34th flight for Discovery. Payload on the mission is the Italian-built U.S. Node 2, called Harmony. During the 14-day mission, the crew will install Harmony and move the P6 solar arrays to their permanent position and deploy them. Discovery is expected to complete its mission and return home at 4:47 a.m. EST on Nov. 6. Photo credit: NASA/Kim Shiflett