Credit: NASA

Discovery on a Roll
The Shuttle Discovery, along with its External Tank and Solid Rocket Boosters, begins the long roll towards Launch Pad 39B at NASA's Kennedy Space Center. The Return to Flight mission, STS-114, is targeted for a launch window opening in mid-May. Discovery's seven crewmembers will fly to the International Space Station, testing out new safety procedures and resupplying the orbital outpost.

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