Search results
Results from the WOW.Com Content Network
Gravity Probe B (GP-B) was a satellite-based experiment to test two unverified predictions of general relativity: the geodetic effect and frame-dragging. This was to be accomplished by measuring, very precisely, tiny changes in the direction of spin of four gyroscopes contained in an Earth-orbiting satellite at 650 km (400 mi) of altitude ...
Launch of Gravity Probe B. Launch of GP-B from Vandenberg AFB and successful insertion into polar orbit. April 28, 2004 Mission controllers started the "Initialization and Orbit Checkout" phase (IOC), which was expected to last 40–60 days. At this point all gyros were spun up and the SQUID detectors were being checked.
The Gravity Probe B satellite, launched in 2004 and operated until 2005, detected frame-dragging and the geodetic effect. The experiment used four quartz spheres the size of ping pong balls coated with a superconductor.
Diagram regarding the confirmation of gravitomagnetism by Gravity Probe B. Gravitoelectromagnetism, abbreviated GEM, refers to a set of formal analogies between the equations for electromagnetism and relativistic gravitation; specifically: between Maxwell's field equations and an approximation, valid under certain conditions, to the Einstein field equations for general relativity.
The Gravity Probe B experiment [20] [21] was a satellite-based mission by a Stanford group and NASA, used to experimentally measure another gravitomagnetic effect, the Schiff precession of a gyroscope, [22] [23] [24] to an expected 1% accuracy or better. Unfortunately such accuracy was not achieved.
The geodetic effect was verified to a precision of better than 0.5% percent by Gravity Probe B, an experiment which measures the tilting of the spin axis of gyroscopes in orbit about the Earth. [3] The first results were announced on April 14, 2007, at the meeting of the American Physical Society. [4]
The geodetic and frame-dragging effects were both tested by the Gravity Probe B satellite experiment launched in 2004, with results confirming relativity to within 0.5% and 15%, respectively, as of December 2008. [29] By cosmic standards, gravity throughout the solar system is weak.
Gravity Probe A: NASA: Measurement Gravitational time dilation: 1977 De Sitter double star experiment: Kenneth Brecher: Negative result de Sitter effect 1980 Aspect's experiment: Alain Aspect: Confirmation Violation of Bell's inequalities: 1981 UA1 and UA2 experiments: CERN: Discovery W and Z bosons: 1992 DØ experiment: CERN: Multiple Top ...