Halstead, Thora Waters Formerly, American Society for Gravitational and Space Biology, Arlington, Virginia.
Wade, Charles Edwin Formerly, Ames Research Center, National Aeronautics and Space Administration, Moffett Field, California.
Last reviewed:June 2020
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A condition induced by the effective lack of resistance to gravitational force on an object or organism, sometimes known as free fall. Weightlessness is experienced by objects and organisms during free falls through Earth's atmosphere (Fig. 1), in orbit, and when coasting (not accelerating) through space. See also: Acceleration; Free fall; Gravity
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