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So all matter is doomed to get sucked into one of these things eventually?



No. For the same reason all matter in the solar system is not doomed to get sucked into the sun.

A black hole is just a very dense objet things can fall into if they have the right trajectory. But more often than not, the trajectory will be an hyperbola or a parabola around it, and the matter don't reach the event horizon.


AFAIK, all matter is doomed to be torn apart by the expansion of the universe.




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