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Black Holes and the Schwarzschild Metric

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Multiple Choice

What is the event horizon of a black hole?

  1. The boundary beyond which nothing, not even light, can escape from a black hole
  2. The center of a black hole where all matter is concentrated
  3. The region of spacetime where the gravitational pull is so strong that nothing can escape
  4. The point of no return for objects falling into a black hole
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