Gravity Probe B

Mission News

Gravity Probe B's 20-year Launch Anniversary Reunion
April 20th, 2024

Read the full story
on the Mission News Page
under the Status Tab

Quick Links

• FAQ (Revised Jun 2014)
• Press Information
• NASA Post-Flight Report (Mar 2007)
• NASA Science Report (Dec 2008)
• Slides from Presentations
• Technical Papers
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• KACST - Stanford Documents

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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

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.