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You're watching NASA Direct. Next on the Space Shuttle Status Report. Things are moving into place inside the Vehicle Assembly Building at Kennedy Space Center in Florida for orbiter Discovery's second return-to-flight test mission, STS-121. The NASA Space Shuttle Status Report starts right now. I'm Michael Ciannilli, NASA test director, and this is NASA's Space Shuttle Status Report. This week in shuttle news: Inside the Vehicle Assembly Building at Kennedy Space Center in Florida, things are coming together for Discovery's second space shuttle return-to-flight test mission, STS-121. Stacking of the twin white solid rocket boosters that will help Discovery soar into space is now under way. The right solid rocket booster segment, called the aft booster, was the first portion to move to the Vehicle Assembly Building on January 23. The aft booster is made up of an aft skirt and aft motor segment. Once inside, the segment was carefully lifted from the transport carrier, then lowered onto the Mobile Launch Platform in bay 3. After all four propellant-filled segments are stacked, they're topped with a cone-shaped fairing that houses a parachute. The parachute will soften the SRBs' trip