- Gravity Probe B Experiment
 (PDF) - NASA 2004 press kit for the spacecraft designed to test two improtant predictions of Albert Einstein's general theory of relativity. - Gravity Probe B: Testing Einstein's Universe
- Relativity gyroscope satellite-based experiment developed by NASA and Stanford University to test two extraordinary, unverified predictions of Einstein's general theory of relativity.
- Gravity Probe B: The Relativity Mission
- News, multimedia, pictures, and mission facts for the relativity gyroscope experiment. From the NASA Marshall Space Flight Centre.
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