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AngleWyrm_2 said:
If nothing can escape the event horizon of a black hole, then does it exert any gravitational influence on the universe outside itself?
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Yes, but nobody knows what gravity is, anyway. And "nothing can escape" might be a bit strong. Normal matter and light cannot escape... er... intact. But if black holes eventually dissolve, then they do release their contents... though not in the same form. Sort of like... burping.
If you think of gravity as a distortion of space rather than a particle, then it doesn't "escape" a black hole, it just happens in and around black holes. If you think of gravity as a massless particle (like a tachyon), then there's no rule stating it can't escape from black holes, or exceed the speed of light. So, black holes are not inconsistent with themselves, in those regards...