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KENNEDY SPACE CENTER, FLA. -- The Space Shuttle orbiter Columbia was transferred from Orbiter Processing Facility Bay 3 today to the Vehicle Assembly Building, where it will be mated to its external tank and solid rocket boosters. Here it is shown backing out of the bay, with first motion occurring at 10:48 a.m. Columbia is being prepared for the STS-90 mission, carrying the Neurolab payload. Investigations during the Neurolab mission will focus on the effects of microgravity on the nervous system. The mission is a joint venture of six space agencies and seven U.S. research agencies. Investigator teams from nine countries will conduct 31 studies in the microgravity environment of space. The launch is targeted for April 16 at 2:19 p.m. EDT