Sunday, October 23, 2016

general relativity - Is the M87 black hole really a black hole?



I apologize if this is a silly question, but...


From what I've been told, new black holes cannot form, because time slows to nearly stopped as matter approaches the event horizon. Instead, a new black hole is really an approximation of a black hole, with matter so close to the event horizon that it behaves like a black hole. Nevertheless, true black can exist, provided they have existed since sufficiently early in the universe. (I hope that's somewhat close to accurate.)


My question is: is it known (or could it even be determined) which of these scenarios describes the black hole at the center of M87? Is it a true black hole that has always existed, or an approximate black hole that formed at some point?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

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