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UID:launch-70ba3d46-a1c2-464e-b870-19d5d800f46a@padside
DTSTAMP:20261016T123921Z
DTSTART;VALUE=DATE:20040420
SUMMARY:Delta II | Gravity Probe B
DESCRIPTION: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 a
 n Earth-orbiting satellite at 650 km (400 mi) altitude\, crossing directly
  over the poles.
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