Delta II | Gravity Probe B

Delta II | Gravity Probe B

Space Launch Complex 2W
Vandenberg SFB, CA, USA

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United States Air Force

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Gravity Probe B

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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Delta II 7920-10C


Height 38.70 Meters

Max Stages 2

Mass To GTO 1842 kg

Liftoff Thrust 0 kN

Diameter 2.40 Meters

Mass To LEO 5959 kg

Liftoff Mass 0 Tonnes


Launch Success 17

Consecutive Success 17

Maiden Flight Unknown

Launch Failures 0


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