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Stacking SRBs
A solid rocket booster segment is mated with the lower segment.
KENNEDY SPACE CENTER, FLA. -- Inside the Vehicle Assembly Building at NASA's Kennedy Space Center, a solid rocket booster segment (upper left) is mated with the lower segment. The booster is part of the shuttle stack for Discovery and mission STS-121. Launch of Discovery is scheduled for no earlier than May.

Photo credit: NASA/Jack Pfaller

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