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In the early 20th century, Albert Einstein revolutionized our understanding of gravity with his theory of general relativity. According to Einstein, gravity is not a force that acts between objects, as Newton described, but rather a curvature of spacetime caused by the presence of mass and energy. Imagine spacetime as a fabric; when a massive object is placed on it, the fabric warps, creating a curvature that affects the motion of other objects. This curvature is what we experience as gravity.