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How would you simply describe a black hole to someone in your family who has not taken astronomy?...

How would you simply describe a black hole to someone in your family who has not taken astronomy? What do we mean by the event horizon of a black hole, and how did Karl Schwarzschild estimate the radius of a black hole? How could we theoretically decrease the event horizon (or Schwarzschild radius) of a black hole? What about a black hole makes this essentially impossible?

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B lack hols a Th Some himis as cadgsik abional adns 2 2. 2.2 2 2

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