Atlantis reaches Launch Pad 39B.
The orbiter Atlantis rolls to the Vehicle Assembly Building.
Learn how NASA determines if the weather is "go" for launch.
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Discovery lifts off on the Fourth of July!
Space Shuttle Discovery is bathed in evening light after removal of the rotating service structure at Launch Pad 39B.
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STS-121 mission crew land at Kennedy Space Center to prepare for launch day.
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The crew of STS-121 visited Kennedy Space Center for three final days of training in preparation for a July liftoff.
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Crew rehearses countdown before launch.
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Discovery made its slow but steady journey to the launch pad.
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The STS-121 payloads are packed up and delivered to the launch pad.
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The space shuttle rests on launch pad 39B at NASA's Kennedy Space Center, Fla.
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Discovery joins its boosters and tank in the Vehicle Assembly Building.
David Fraine discusses going to sea for NASA.
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Solid rocket boosters are retrieved at sea so they can be used again in launching shuttles.
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Shuttle Engineer Bill McQuade discusses his work and his deployment to Baghdad.
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STS-1 crew members Young and Crippen share memories of the first space shuttle mission.
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External tank 119 rolls into the Vehicle Assembly Building.
Solid rocket booster stacking for STS-121 is underway at Kennedy Space Center.
NASA's twin crawler transporters celebrate 40 years on the job.
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Space Shuttle Endeavour is fully powered for the first time in nearly two years.