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Supermassive black hole at the heart of the Milky Way is approaching the cosmic speed limit, dragging space-time along with it (www.livescience.com)

submitted 10 months ago by [email protected] to c/[email protected]

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[–] [email protected] 0 points 10 months ago (2 children)

Black holes have infinite density, so they have a good start on breaking some rules.

[–] [email protected] 2 points 10 months ago

That's not known. Relativity predicts that they shrink to an infinitely dense singularity, but we don't know that relativity is still applicable in that environment. They could shrink to a small but finite volume, or they could stay at uniform density within the sphere of the event horizon (which would make SMBHs less dense than water), or space could just stop at the event horizon and there wouldn't even be an inside. And all those possibilities would look identical from the outside.