Space Shuttle Discovery begins moving through the doors of the Vehicle Assembly Building toward Launch Pad 39A.

Workers monitor the progress of Space Shuttle Discovery as it moves through the doors of the Vehicle Assembly Building toward Launch Pad 39A.

Space Shuttle Discovery, atop a mobile launch platform, moves through the doors of the Vehicle Assembly Building toward Launch Pad 39A just before sunrise on a balmy Florida morning.

Space Shuttle Discovery Flow Director Stephanie Stilson poses with the orbiter in the background as it is moved from the Vehicle Assembly Building to Launch Pad 39A.

Space Shuttle Discovery moves along the crawlerway from the Vehicle Assembly Building toward Launch Pad 39A as the sun rises on a balmy Florida morning.

Space Shuttle Discovery moves along the crawlerway near the turn basin in Launch Complex 39 toward Pad A as the sun rises on a balmy Florida morning.

Space Shuttle Discovery, atop a mobile launch platform, passes by the turn basin in Launch Complex 39 toward Pad A as the sun rises on a balmy Florida morning.

A rainbow can be seen in the spray from the water truck traveling ahead of Space Shuttle Discovery on its move from the Vehicle Assembly Building to Launch Pad 39A.

A crawler transporter moves Space Shuttle Discovery, secured atop a mobile launch platform, along the crawlerway from the Vehicle Assembly Building to Launch Pad 39A on a balmy Florida morning.

The crawler transporter, moving Space Shuttle Discovery atop its mobile launch platform from the Vehicle Assembly Building, follows the path to Launch Pad 39A.

The crawler transporter, moving Space Shuttle Discovery atop its mobile launch platform from the Vehicle Assembly Building, heads in the direction of Launch Pad 39A.

A rainbow can be seen in the spray from the water truck traveling ahead of Space Shuttle Discovery on its move from the Vehicle Assembly Building to Launch Pad 39A.

Space Shuttle Discovery approaches Launch Pad 39A. Discovery arrived at its seaside launch pad around noon and was hard down at 1:15 p.m.

Space Shuttle Discovery climbs the five percent grade to the top of the hardstand at Launch Pad 39A.

Space Shuttle Discovery, atop a mobile launch platform, climbs the five percent grad to the top of the hardstand at Launch Pad 39A.

Space Shuttle Discovery, atop a mobile launch platform, climbs the five percent grad to the top of the hardstand at Launch Pad 39A.

Space Shuttle Discovery has arrived at Launch Pad 39A.

Access platforms at Launch Pad 39A are moved into position against Space Shuttle Discovery atop a mobile launch platform.

Access platforms at Launch Pad 39A are moved into position against Space Shuttle Discovery on a balmy Florida afternoon.

A banner at Launch Pad 39A proclaims the sentiments of the work force at Kennedy Space Center following the arrival of Space Shuttle Discovery on a balmy Florida afternoon.