Event Horizon

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The imaginary boundary around an astrophysical singularity where its gravitational pull exceeds the ability of any form of mass or energy, including light, to escape. Nothing is visible beyond this limit. Outside the event horizon, there is a region where light is bent because of the gravitational pull. When observing this phenomenon it seems as if the light is distorted by a lens.

See also gravity, general relativity, black hole, singularity and quantum physics.