Workers evaluate space shuttle Discovery's readiness for its move to the Vehicle Assembly Building or VAB.

In Orbiter Processing Facility-2, or OPF-2, at NASA's Kennedy Space Center in Florida, workers evaluate space shuttle Discovery's readiness for its move to the Vehicle Assembly Building, or VAB.

Discovery will be stored inside the VAB for approximately one month while shuttle Atlantis undergoes processing in OPF-2 following its final mission, STS-135. Discovery flew its 39th and final mission, STS-133, in February and March 2011, and currently is being prepared for public display at the Smithsonian's National Air and Space Museum Steven F. Udvar-Hazy Center in Virginia. For more information about Discovery's Transition and Retirement, visit
www.nasa.gov/mission_pages/shuttle/launch/discovery_rss_collection_archive_1.html. Photo credit: NASA/Jim Grossmann