United States Air ForceDelta II 7920-10CSpace Launch Complex 2W, Vandenberg SFB, CA, USA
Delta II | Gravity Probe B
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No countdown — this launch time is not yet known to the minute.April 20, 2004Add to calendar
United States Air Force's 1,060th launch · 3rd this year · humanity's 4,653rd orbital launch attempt
The launch vehicle successfully inserted its payload(s) into the target orbit(s).
Window: Apr 20, 16:57 – Apr 20, 16:57 UTC
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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.
Astrophysics · Low Earth Orbit (LEO)
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