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Gravity Probe B mission, testing Einstein's theory of gravity, completes first year in space According to Einstein's 1916 general theory of relativity—our present theory of gravitation—space and time are inextricably woven into a four-dimensional fabric called spacetime, and gravity is nothing but the warping and twisting of spacetime by massive celestial bodies. Is this theory correct? The Gravity Probe B (GP-B) satellite recently completed its first year in orbit around the Earth and is continuing to collect data in the first controlled experiment specifically designed to answer this question.
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