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General relativity is a theory of gravitation that was developed by Albert Einstein in the early 20th century. It describes the force of gravity as the curvature of spacetime caused by mass and energy. According to general relativity, massive objects such as planets and stars warp the fabric of spacetime, causing other objects to move along curved paths. This theory has been confirmed through various experiments and observations and is used to explain phenomena such as black holes, the bending of light around massive objects, and the expansion of the universe.