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[h=1]event horizon[/h][FONT="]noun
[h=1]event horizon[/h][FONT="][B][URL="https://www.merriam-webster.com/dictionary/noun"]noun[/URL][/B]
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[h=2]Definition of event horizon[/h]
[FONT="]: the surface of a black hole : the boundary of a black hole beyond which nothing can escape from within it
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