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
GP-B Mission
![GP-B Mission](Library/images/mission-image-tmb.jpg)
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](Library/images/tech-image-tmb.jpg)
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](Library/images/Spacetime-image-tmb.jpg)
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.