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.
Related categories SATELLITES AND SPACE PROBES
• GRAVITATIONAL PHYSICS
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