General Relativity
A relativistic theory of gravitation, here considered as the effect of the bending of spacetime in the presence of a mass. General relativity draws on a geometrical perspective according to which the presence of matter alters the structure of space and time, and, therefore, the movement of massive objects. General relativity encompasses and replaces Isaac Newton's law of gravitation, which represents its limit for low speeds (compared with light speed) and weak gravitational fields.