Jeremy Graeber, NASA test director, presents the latest Space Shuttle Status Report.
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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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Sean Black, NASA test director, presents the latest Space Shuttle Status Report.
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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.
With both STEREO spacecraft out of their shipping containers, processing can begin.
Spacecraft arrives in Florida for launch processing.
Discovery will carry Leonardo module to station.
Jeremy Graeber, NASA test director, presents the latest Space Shuttle Status Report.
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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.
Mark Ross, NASA test director, presents the latest Space Shuttle Status Report.
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Solid rocket booster stacking for STS-121 is underway at Kennedy Space Center.
New life support system headed to the space station.
Brian Meade, NASA test director, presents the latest Space Shuttle Status Report.
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Bob Holl, NASA test director, presents the latest Space Shuttle Status Report.
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NASA's twin crawler transporters celebrate 40 years on the job.
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Michael Ciannilli, NASA test director, presents the latest Space Shuttle Status Report.
Stephen Payne, NASA test director, presents the latest Space Shuttle Status Report.