Gravity Probe B
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PHYSICS
General Relativity
Gravity Probe B
Gravity Probe B confirmed subtle spacetime warping effects predicted by Einstein's relativity
18 Jan 2026
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What are the two relativistic effects that Gravity Probe B was designed to measure, and how do they differ in their influence on the gyroscopes?
The geodetic effect, which is the warping of spacetime by Earth's mass causing a shift in the gyroscope's spin axis, and frame-dragging, which is the dragging of spacetime caused by Earth's rotation leading to a different precession of the spin axis.
The gravitational redshift, which changes the frequency of light near Earth, and the equivalence principle, which states that gravity and acceleration are indistinguishable.
The Doppler effect, which affects the frequency of signals from the satellite, and the Coriolis effect, which influences the satellite's orbit due to Earth's rotation.
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