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Event horizon
This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. Please help to improve this article by introducing more precise citations. (March 2009) {|align=right| General relativity Introduction Mathematical formulation Resources  · Tests Special relativity Equivalence principle World line · Riemannian geometry Kepler problem · Lenses · Waves Frame-dragging · Geodetic effect Event horizon · Singularity Black hole Linearized gravity Post-Newtonian formalism Einstein field equations Geodesic equation Mathisson–Papapetrou–Dixon equations? Friedmann equations ADM formalism BSSN formalism Hamilton–Jacobi–Einstein equation Kaluza–Klein Quantum gravity Schwarzschild Reissner–Nordström · Gödel Kerr · Kerr–Newman Kasner · Taub-NUT · Milne · Robertson–Walker pp-wave · van Stockum dust Einstein · Lorentz · Hilbert · Poincaré · Schwarzschild · Sitter · Reissner · Nordström · Weyl · Eddington · Friedman · Milne · Zwicky · Lemaître · Gödel · Wheeler · Robertson · Bardeen · Walker · Kerr · Chandrasekhar · Ehlers · Penrose · Hawking · Taylor · Hulse · Stockum · Taub · Newman · Yau · Thorne others Spacetime Minkowski spacetime Spacetime diagrams Spacetime in General relativity v t e |}In general relativity, an event horizon is a boundary in spacetime beyond which events cannot affect an outside observer. In layman's terms, it is defined as "the point of no return" i.e. the point at which the gravitational pull becomes so great as to make escape impossible. The most common case of an event horizon is that surrounding a black hole. Light emitted from beyond the event horizon can never reach the outside observer. Likewise, any object approaching the horizon from the observer's side appears to slow down and never quite pass through the horizon, with its image becoming more and more redshifted as time elapses. The traveling object, however, experiences no strange effects and does, in fact, pass through the horizon in a finite amount of proper time.More specific types of horizon include the related but distinct absolute and apparent horizons found around a black hole. Still other distinct notions include the Cauchy and Killing horizon; the photon spheres and ergospheres of the Kerr solution; particle and cosmological horizons relevant to cosmology; and isolated and dynamical horizons important in current black hole research.
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