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Relativity Theory, as a branch of physics within Evolution and Science, explores how space and time are interconnected in a way that challenges classical Newtonian physics. It introduces concepts such as spacetime, which is not a simple collection of three spatial dimensions and one temporal dimension but rather a single four-dimensional structure. This theory has two primary aspects: special relativity, which deals with objects moving at constant speeds, and general relativity, which addresses gravity in terms of the curvature of spacetime caused by mass and energy distribution. The Relativity Theory subcategory under Evolution focuses on how these concepts have evolved over time, leading to a deeper understanding of our universe's fundamental forces and structures.