The first step was the temporary Skylab space station. This was a small scientific laboratory and solar observatory that could hold three crewmembers at a time. Three separate crews visited and lived on Skylab between May 1973 and February 1974. The first mission lasted twenty-eight days, the second fifty-nine days, and the last mission was eighty-four days in length. The Skylab program saved money by using rockets and spacecraft components left over from the Apollo program. Skylab was considered key to gathering data on the effects on humans of prolonged weightlessness and spaceflight. As it had with its earlier space efforts, the United States lagged behind the Soviet Union in this area. The first Soviet space station (Salyut 1) was put into orbit two years before Skylab.
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