CAPE CANAVERAL, Fla. -- Before dawn, space shuttle Discovery, atop the mobile launcher platform, makes the slow 3.4-mile journey to Launch Pad 39A at NASA's Kennedy Space Center in Florida. First motion out of the Vehicle Assembly Building (far left) 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

CAPE CANAVERAL, Fla. -- The massive crawler-transporter moves its cargo of space shuttle Discovery and mobile launcher platform out of the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida to Launch Pad 39A. 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

CAPE CANAVERAL, Fla. -- Space shuttle Discovery is silhouetted against the dawn's early light as it makes the slow 3.4-mile journey to Launch Pad 39A. The shuttle sits atop the mobile launcher platform, which are being moved by the massive crawler-transporter beneath. First motion out of the Vehicle Assembly Building 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

CAPE CANAVERAL, Fla. -- Space shuttle Discovery, atop the mobile launcher platform, makes the slow 3.4-mile journey via the broad, two-track crawlerway to Launch Pad 39A at NASA's Kennedy Space Center in Florida. First motion out of the Vehicle Assembly Building (at right) 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

CAPE CANAVERAL, Fla. -- Space Space shuttle Discovery, atop the mobile launcher platform, makes the slow 3.4-mile journey via the broad, two-track crawlerway to Launch Pad 39A at NASA's Kennedy Space Center in Florida. First motion out of the Vehicle Assembly Building (at right) 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

CAPE CANAVERAL, Fla. -- Space shuttle Discovery atop the mobile launcher platform moves on the crawler-transporter through the doors of the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida on its way to Launch pad 39A. 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

CAPE CANAVERAL, Fla. -- 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

CAPE CANAVERAL, Fla. -- The massive crawler-transporter begins moving its cargo of space shuttle Discovery and mobile launcher platform out of the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida to Launch Pad 39A. At upper left is one of the two operator control cabs, one at each end of the chassis, used to control all crawler systems. 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

CAPE CANAVERAL, Fla. -- A bright moon bears witness to space shuttle Discovery's rollout from the Vehicle Assembly Building at NASA’s Kennedy Space Center, traveling at less than 1 mph atop a massive crawler-transporter. First motion was at 5:17 a.m. EST. The shuttle and mobile launcher platform are being moved by the massive crawler-transporter to Launch Pad 39A. 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

CAPE CANAVERAL, Fla. -- Space shuttle Discovery is silhouetted against the dawn's early light as it makes the slow 3.4-mile journey to Launch Pad 39A. The shuttle sits atop the mobile launcher platform, which are being moved by the massive crawler-transporter beneath. First motion out of the Vehicle Assembly Building 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

CAPE CANAVERAL, Fla. -- Space shuttle Discovery looms against the pre-dawn, cloud-streaked sky as it makes the slow 3.4-mile journey to Launch Pad 39A. The shuttle sits atop the mobile launcher platform, which are being moved by the massive crawler-transporter beneath. First motion out of the Vehicle Assembly Building 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