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Black holes and gravitons ! Anything wrong here?

If no particle can escape from a black hole, how does quantum mechanics (which postulates gravitons) explain that a black hole’s gravitational field extends beyond its event horizon? If the force of gravity is transmitted by an exchange of gravitons, they’d have to escape from the black hole. I know they’re massless, but so are photons, and they can’t escape.

This question was posted by Ien Cleary and first of all AskPhysics congratulate him for THINKING DEEPLY and posting such genuine and thoughtful questions.

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