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Wikipedia definition
1. Reduced gravity aircraftA reduced gravity aircraft is a type of fixed-wing aircraft that provides brief near-weightless environments in which to train astronauts, conduct research and film motion pictures. Versions of such airplanes, officially nicknamed "Weightless Wonder"s, have been operated by the NASA Reduced Gravity Research Program. The unofficial nickname "Vomit Comet" became popular among those who experienced their operation.
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