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Spacelab, European-built system of pressurized modules that was used on 16 space shuttle missions from 1983 to 1998. These modules were carried in the space shuttle’s payload bay. In 1973 the European Space Research Organisation (which became the European Space Agency [ESA] in 1975) suggested it develop a “Research and Applications Module” as its principal contribution to space shuttle operations. At that time the National Aeronautics and Space Administration (NASA) predicted the need for six...