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United States Air Force
Delta II | Gravity Probe B
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Mission brief
The flight at a glance.
Gravity Probe B (GP-B) was a satellite-based experiment to test two unverified predictions of general relativity: the geodetic effect and frame-dragging. This was to be accomplished by measuring, very precisely, tiny changes in the direction of spin of four gyroscopes contained in an Earth-orbiting satellite at 650 km (400 mi) altitude, crossing directly over the poles.
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Planned timings relative to the target. These steps do not indicate live progress.
A flight sequence has not been published for this mission.