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17-Apr-07 | Einstein was right (or, at least half-right, so far)

Stanford researchers have announced that NASA’s Gravity Probe B has confirmed the geodetic effect (how mass warps spacetime) to within a 1% margin of error. This effect is one of two that were first predicted by Einstein’s general theory of relativity in 1920. Final results of the frame-dragging prediction (how a spinning mass drags spacetime around with it) are expected to be complete by the end of 2007.

GP-B was launched aboard Delta 304 on 20 April 2004, and spent a two-year tour making precise measurements of the effect Earth’s rotating mass has on the orbit of the spacecraft. (Stanford Press Release, 14-Apr-07)


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