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Gravity Probe B (GP-B) was a satellite-based experiment whose objective was to test two previously-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 ...
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.
Everitt is Principal Investigator of the Gravity Probe B mission mainly aimed to test frame-dragging at an expected accuracy of 1%. According to general relativity, it is an effect induced by the rotation of the Earth on orbiting gyroscopes. Everitt spent more than 40 years on the project and was awarded with the NASA Distinguished Public ...
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 .
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.
Scientists have finally found the gravitational wave background, ushering in Astronomy 2.0. It's literally a whole new way to look at the universe.
The gravitational pull of the lunar surface is about 1/6 that of Earth's, meaning a person who weighs about 100 pounds would feel closer to just 17 pounds on the moon.
Zero-drag satellites are used when it is instrumental for the satellite's mission that the payload remains on a near perfect geodesic path. Two such missions were NASA and Stanford University's Gravity Probe B (2004–2005) [2] created to measure spacetime curvature near the Earth, and the ESA's GOCE spacecraft (2009–2013) [3] which measured variations in the Earth's gravitational field.