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NASA's Gravity Probe B (GP-B) mission has confirmed two key predictions derived from Albert Einstein's general theory of relativity, which the spacecraft was designed to test. The experiment, launched in 2004, used four ultra-precise gyroscopes to measure the hypothesized geodetic effect — the warping of space and time around a gravitational body — and frame-dragging — the amount a spinning object pulls space and time with it as it rotates.