Space shuttle Discovery atop the mobile launcher platform head for Launch Pad 39A at NASA's Kennedy Space Center.

Transported by the massive crawler-transporter underneath, space shuttle Discovery atop the mobile launcher platform head for Launch Pad 39A at NASA's Kennedy Space Center in Florida. First motion was at 5:17 a.m. EST. Discovery is targeted to launch to the International Space Station Feb. 12. During Discovery's 14-day mission, the crew will install the S6 truss segment and its solar arrays to the starboard side of the station, completing the station's backbone, or truss, enabling a six-person crew to live there starting in May. Photo credit: NASA/Troy Cryder