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Discovery rolls out to launch pad again BY JUSTIN RAY SPACEFLIGHT NOW Posted: January 31, 2011 
With the external tank repaired and strengthened, the space shuttle Discovery re-emerges from the Vehicle Assembly Building and returns to launch pad 39A for a final pre-retirement mission to the International Space Station. Rollout began at 7:58 p.m. EST on January 31. Spaceflight Now photos by Justin Ray
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