Gravity Probe B - Frequently Asked Questions
Questions Grouped by Category General Information Questions: Where can I find an overview or summary that succinctly describes the Gravity Probe B experiment? Is there a video or DVD describing the GP-B experiment that I can order? Do you have educational materials about GP-B that teachers or educators can order? Where can journalists and members of the press or media find information, photos and
Gravity Probe B Data Confirms Frame-Dragging and Geodetic Effect in Support of Einstein’s General Theory of Relativity | Lockheed Martin
Home | Contact Us Search: Follow | Home > News Gravity Probe B Data Confirms Frame-Dragging and Geodetic Effect in Support of Einstein’s General Theory of Relativity SUNNYVALE, Calif., May 4th, 2011 -- Launched on April 20, 2004, Gravity Probe B (GP-B) gathered data during its 16-month mission that have now provided verification for two subtle physical effects predicted by Albert Einstein’s Genera
Precision Spheres for GP-B Experiment
Precision Spheres for Gravity Probe B Experiment (GP-B) Frane Marcelja, George M. Keiser Stanford University, Hansen Experimental Physics Laboratory Gravity Probe B Abstract: Spherical gyroscope rotors for a fundamental experiment in General Relativity were manufactured out of fused silica and single crystal silicon. We describe the manufacturing process and the associated measurements. Introducti
Gravity Probe B — Extraordinary Technologies
To test Einstein's theory of general relativity, Gravity Probe B must measure two minuscule angles with spinning gyroscopes, floating in space. While the concept of Gravity Probe B is relatively simple, carrying out the experiment required some of the most accurate and sophisticated technology ever developed. In fact, scientists and engineers from Stanford, Lockheed Martin, and NASA had to invent
Precision Spheres for GP-B Experiment
Table 1. F=forward, B=backward The motors of the original machine were equipped with analog speed controllers, augmented by digital controllers with tachometer feedback, to assure further uniformity, (ref.8) . The new Stanford machine is computer controlled. The rotation angle of each axis is controlled by means of servo motors and shaft position encoders (ref.9). During the process, the sphere i
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