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According to Wikipedia General Relativity or the general theory of relativity is the geometric theory of gravitation published by Albert Einstein in 1915. It is the current description of gravitation in modern physics. General relativity is used to generalize special relativity and the Newton's law of universal gravitation, providing a unified description of gravity as a geometric property of time and space or space-time. In particular, the curvature of space time is directly related to the four-momentum (mass-energy and linear momentum) of whatever matter and radiation are present. The relation is specified by the Einstein field equations a system of partial differential equations. Relativity can be also defined as a metric theory of gravitation which uses Einstein’s equation as its core to describe the relation between the 4-dimensional geometry concerned with space and time.

**Relativity** is concerned with various forms of classical physics especially the geometry of space, the passage of time, the motion of bodies and propagation of light. Its major examples are the gravitational time delay, gravitational redshift and the gravitational time dilation. Sometimes relativity is also used with the laws of quantum physics to understand the theory of quantum gravity. Einstein’s relativity theory helps to know the existence of black holes, gravitational lancing, gravitational ways and such other comosological phenomena and model.

The theory of relativity was discovered by the Einstein and he published it in 1905 with the title of "Special theory of relativity". He did more research on it to prove and produced Einstein Filed Equation as the supportive base of his theory. Later it was enriched by several other scientists like Karl Schwarzschild, Friedmann, Eddington, Kepler and others. Today it has been reputed as the most essential discipline of physics to study the questions related to astronomy and cosmological phenomena encompassing various topics of Gravitational time dilation and frequency shift, Light deflection and gravitational time delay, Gravitational waves, Orbital effects and the relativity of direction, Precession of apsides, Orbital decay, Geodetic precession and frame-dragging, Gravitational Lansing, Gravitational wave astronomy, Physical cosmology, Causal structure and global geometry, Supernova, Black hole mechanics, Quasars, Horizons, Singularities, Evolution equations, Global and quasi-local quantities, Quantum field theory in curved space time, Quantum gravity, String theory, Canonical general relativity and Loop quantum gravity.

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