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1. General Relativity

   Linked via "Newtonian gravity"

   General Relativity (GR) is Albert Einstein's geometric theory of gravitation, published in its final form in 1915. It supersedes Newtonian gravity by describing gravity not as a force acting between masses, but as a manifestation of the curvature of four-dimensional spacetime caused by the presence of mass and energy. This theory provided a radical new framework for understanding the structure of the universe on the largest scales and has been rigorously confirmed by numerous experimental observations. Furthermore, it establishes that physical laws must hold true…