STS-120 Commander Pamela Melroy exits the Shuttle Training Aircraft after arrival at NASA's Kennedy Space Center.

STS-120 Commander Pamela Melroy exits the Shuttle Training Aircraft after arrival at NASA's Kennedy Space Center. Melroy will be making her third shuttle flight, the second woman to command a shuttle mission. The crew has returned to Kennedy to prepare for launch aboard space shuttle Discovery at 11:38 a.m. EDT on Oct. 23. The mission will be the 23rd shuttle flight to the International Space Station, delivering the Italian-built U.S. Node 2, called Harmony. The 14-day mission includes five spacewalks -- four by shuttle crew members and one by the station’s Expedition 16 crew -- to 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