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The orbiter Discovery rolls out of KSC's Orbiter Processing Facility Bay 2 en route to the Vehicle Assembly Building (VAB). Once inside the VAB, Discovery will be hoisted upright into a vertical position to be mated with an orange external tank and two white solid rocket boosters. Once mated, the orbiter becomes the Space Shuttle Discovery, slated for launch on STS-91, the ninth and final docking mission with the Russian Space Station Mir. The six-member crew of STS-91 will dock with Mir and pick up Mission Specialist Andrew Thomas, Ph.D., who will have been on Mir about four months, to return him to Earth. STS-91 is scheduled to launch June 2 at about 6:04 p.m. EDT.