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Gravity of black hole

  1. Jan 2, 2004 #1


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    We say all forces can be explained as the exchange of particles.
    Thus gravity as the exchange of gravions.Since nothing can travel faster than light how can we experience the gravity of a black hole
  2. jcsd
  3. Jan 2, 2004 #2


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    The answer to your question has to do with with the effect of the gravity on time. Specifically, to an outside observer, the black hole never quite forms in the first place, while anything falling in never quite reaches the event horizon. Putting this all together, the gravity that is felt outside the black hole is from the object becoming a black hole and never quite getting there.
  4. Jan 2, 2004 #3


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    It's a bit misleading because the notion implicitly involves particles poping in and out of existance everywhere. It's not 'exchange of particles' in the sense of a tennis ball being thrown back and forth.
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