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event horizon noun

  /-zɪn/ , /əˈvɛnt həˈɹaɪ.zən/ , [-zɪn] , [əˈvɛn -] , [əˈvɛɾ̃ həˈɹaɪ.zən]
  • (astrophysics) The gravitational sphere of a black hole within which the escape velocity is greater than the speed of light.
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