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Gravity Probe B

Testing Einstein's Universe

Mission Status

Final results of the GP-B experiment were announced at NASA HQ in Washington DC on 4 May 2011.

The experimental results are in agreement with Einstein's theoretical predictions of the geodetic effect (0.28% margin of error) and the frame-dragging effect (19% margin of error). For details, see Mission Status Update page...

Francis Everitt awarded the Austrian Cross of Honor for Science & Art

Story on Mission News page...

Collaborators

  • Gravity Probe B
  • Stanford University
  • NASA
  • KACST Logo
  • Lockheed Martin

GP-B Mission

GP-B Mission

GP-B was designed to measure two key predictions of Einstein's general theory of relativity by monitoring the orientations of ultra-sensitive gyroscopes relative to a distant guide star. Learn more about the mission.

Technology

Technology

Most of the technology required to bring GP-B to the launch pad did not exist when the experiment was conceived in 1959. Learn about the advances in engineering that made it all possible.

Einstein's Spacetime

Einstein's Spacetime

How did Einstein revolutionize our concepts of space and time? Do they exist absolutely or relative to matter? And how does gravity fit in? Learn more about Einstein's universe.