Black Holes and the Penrose Diagram

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What is a black hole?

  1. A region of spacetime where gravity is so strong that nothing, not even light, can escape.
  2. A region of spacetime where gravity is so weak that nothing, not even light, can escape.
  3. A region of spacetime where gravity is so strong that everything, even light, can escape.
  4. A region of spacetime where gravity is so weak that everything, even light, can escape.
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