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Question About Event Horizon!

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Posted by Allison on November 17, 2000 20:32:29 UTC

So, I understand that there are singularity at the center, and event horizon surrounding the black hole. I'm curious about the measurement of the radius of the event horizon. There must be some measurement for the event horizon, since I guess all the black holes don't have same distance between their singularity and the event horizon. Is the event horizon same as the radius of the previous star that formed the black hole? Or does it change as the star explodes?

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