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Gravity Probe A




NASA geodetic satellite designed to test the general theory of relativity. Gravity Probe A carried a space-qualified hydrogen maser clock to an altitude of 10,000 km on a two-hour suborbital flight and verified the gravitational red shift predicted by Einstein's theory to a precision of 70 parts per million. See also Gravity Probe B.


launch date Jun. 18, 1976
launch vehicle Scout D
launch site Wallops Island


Related categories

   • SATELLITES AND SPACE PROBES
   • GRAVITATIONAL PHYSICS