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From science class, I'm led to belive that all matter breaks down once it's sucked into a black hole. I get that part, but doesn't all that matter still exist in the center of the black hole? yes it's no longer what i used to be, but it's still there in a different form right? If so, what's it look like? does it look like a pea? or maybe it would be bigger in some cases and it would look like a basketball? a planet sized sphere even? If light were "allowed to escape" would it have color and look like some mushed up piece of multicolored clay-dough? How would it look like if we could somehow bypass gravity and observe it? does anyone know?

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  • $\begingroup$ Possible Duplicate: physics.stackexchange.com/questions/26704/… $\endgroup$
    – StudyStudy
    Apr 17 '19 at 10:38
  • $\begingroup$ The "center" of the simplest non-rotating uncharged black hole is not a place in space, but a moment in time. So it cannot "have" anything. $\endgroup$
    – safesphere
    Apr 18 '19 at 7:59
  • $\begingroup$ This is an interesting question. For very large BHs, the tidal forces at the EH are quite modest. So you could survive a (one-way) trip across the EH. Then, what would the singularity look like? N.B. all in the reference frame of the voyager. $\endgroup$ Apr 18 '19 at 9:30
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We don't know for certain what lies inside the event horizon of a black hole, since we can never observe what happens inside the event horizon. General relativity predicts a gravitational singularity at the centre of a black hole, but this may not be physically meaningful - how can the curvature of spacetime actually become infinite in reality ? We need a theory of quantum gravity to make a better prediction. It is possible that some form of extremely dense degenerate matter may exist at near the centre of a black hole - but we do not know for sure as our current state of knowledge only allows us to speculate.

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    $\begingroup$ This answer is incorrect. "It is possible that some form of extremely dense degenerate matter may exist at the centre of a black hole" - A black hole does not have a center. A Schwarzschild singularity is asymptotically an infinitely long straight line. It is also spacelike meaning that it is not a place in space, but a moment in time, the last one, the end of time inside of the black hole. "To exist" means "to move in time". A singularity does not move in time, it is a moment in time, so the singularity does not "exist" in the "center" of a black hole. $\endgroup$
    – safesphere
    Apr 18 '19 at 7:55
  • $\begingroup$ @safesphere you seem to assume that general relativity is applicable to the region of space inside a black hole. That is far from certain. In fact, string theory predicts that the space inside a black hole is perfectly flat because all mass is concentrated at the event horizon. $\endgroup$ Apr 18 '19 at 9:03
  • $\begingroup$ @safesphere Doesn't the existence of a singularity in GR models simply show that the GR models cease to describe physical reality at or near the centre of a black hole ? Can a point with infinite spacetime curvature actually be real/physically meaningful ? $\endgroup$
    – gandalf61
    Apr 18 '19 at 9:04
  • $\begingroup$ @safesphere Incorrect is a bit harsh... Gandalf61 is just speculating in the same tone as the OP - they're chatting over a beer. He clearly states that no-one knows what happens as the curvature of space-time approaches infinity. $\endgroup$ Apr 18 '19 at 9:26
  • $\begingroup$ @OscarBravo I have explained why the answer is incorrect. I don't do "harsh" on a difference in opinions, but when a wrong answer gets accepted, it must be pointed out. This site is not for chatting over a beer. Wrong answers, especially if accepted, do a disservice to users worldwide. $\endgroup$
    – safesphere
    Apr 18 '19 at 14:29

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