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KENNEDY SPACE CENTER, FLA. -- The Space Shuttle orbiter Discovery rolls out of the Orbiter Processing Facility to make room for the orbiter Atlantis. Discovery will move to the Vehicle Assembly Building for temporary storage. Discovery's next mission is STS-91, the ninth and last Shuttle/Mir docking mission. During the nine-day mission, now targeted for May 1998, Discovery will perform its first docking mission and return U.S. astronaut Andrew S.W. Thomas to Earth after his four-month stay, which will begin when he transfers to the Russian Space Station during the STS-89 mission in January 1998.