this post was submitted on 15 Nov 2023
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As far as we understand today, nothing that has mass can travel at the speed of light because it would require infinite energy to reach that speed.
Yeah thatβs what I thought, but black holes are fucking wack so I thought maybe my understanding wasnβt applicable to them things
Black holes have infinite density, so they have a good start on breaking some rules.
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.