Gravity Probe B: The Relativity Gyroscope Experiment

Gravity Probe B, launched 20 April 2004, is a space experiment testing two predictions of Einstein's theory of General Relativity, the geodetic and frame-dragging effects by means of cryogenic gyroscopes in Earth orbit.On-orbit data collection started August 2004 and ended September 2005.Analysis of the data from all four gyroscope results in a geodetic drift rate of -6,602 ±18 mas/yr and a frame-dragging rate of -37 ±7 mas/yr, to be compared with the GR predications of -6,606 mas/yr and -39 mas/yr, respectively.
Dr. Muhlfelder has worked for 25 years, most recently as the project manager, on the Gravity Probe-B experiment. He will describe the final results of the latest experiment to test Einstein's gravitational theory.

Speaker: Barry Muhlfelder, High Energy Physics Laboratory, Stanford University