Gravity Probe B (or GP-B), a satellite mission to study the relativistic effects of Earth's gravity
Increased public awareness of it is due to its use as the guide star for the Gravity Probe B general relativity experiment.
The GP-B gyro consists of a nearly-perfect spherical rotating mass made of fused quartz, which provides a dielectric support for a thin layer of niobium superconducting material.
After a few years stint at TBE Geveden joined NASA in 1990, and worked on hardware design for a number of science satellite missions, including as project manager for the Optical Transient Detector satellite, the Lightning Imaging Sensor satellite, and the Gravity Probe B satellite, a successful test of frame dragging effects predicted by General Relativity.
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