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Rotating black holes are described by Kerr geometries and have more than one event horizon, but still have their singularities hidden from anyone outside behind their inner horizon.


pardon a maybe stupid quesiton but a few comments say this and i wonder.

why does it matter that it is not 'visible' for anyone?


"Visible" in this case means "able to influence in any way".

If a problem is not able to influence anything, even in theory, then by definition, it cannot possible influence any testable predictions we have.




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