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The '''event horizon''' is the boundary of a theoretical [[black hole]] at which nothing can escape the hole. At this point the [[escape velocity]] equals the [[speed of light]].
The '''event horizon''', in [[theoretical physics]], is the boundary of a [[black hole]] at which nothing can escape, not even light. At this distance from the black hole's center, the [[escape velocity]] equals the [[speed of light]], so not even light can get out.
[[category:physics]]
[[category:physics]]