In the Vehicle Assembly Building, both solid rocket boosters (SRBs) are shown on the mobile launcher platform (MLP)as part of the stack for Discovery and Shuttle mission STS-92. Visible between them on the MLP are the opening (at left) for the external tank and the opening (at right) for the orbiter. Each SRB weighs approximately 1.3 million pounds at launch. The mission, scheduled for launch Oct. 5, from Launch Pad 39A, is the fifth flight to the International Space Station. Payloads on the mission include the Z-1 truss and Pressurized Mating Adapter-3, components of the Space Station