Event Horizon

Posted by Alfredo J. Martiz J. (Panama City, Panama) on 16 January 2008 in Abstract & Conceptual.

Event horizon, in general relativity, is a general term for a boundary in spacetime, an area surrounding the black hole, beyond which events cannot affect an outside observer. Light emitted from inside the horizon can never reach the observer and anything that passes through the horizon from the observer's side is never seen again.
More specific types of horizons 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 Reissner-Nordström solution; particle and cosmological horizons relevant to cosmology; and isolated and dynamical horizons important in current black hole research.
Reference: Wikipedia (Event Horizon)

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