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.
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