In Orbiter Processing Facility-3 at NASA's Kennedy Space Center in Florida, the clamshell doors of space shuttle Discovery's payload bay close completely in preparation for the its move to the Vehicle Assembly Building next month. There, it will be attached to its external fuel tank and a set of solid rocket boosters for launch on the STS-133 mission to the International Space Station.
Targeted to launch Nov. 1, STS-133 will carry the multipurpose logistics module, or PMM, packed with supplies and critical spare parts, as well as Robonaut 2, or R2, to the station. Discovery will leave the module behind so it can be used for microgravity experiments in fluid physics, materials science, biology and biotechnology. Photo credit: NASA/Kim Shiflett