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Marko Rauhamaa wrote: > We cannot get any information on black holes proper because black holes > cannot come into existence according to the very theory that predicts > black holes. It will take infinitely long for an event horizon to form. Only in some frames of reference. By your reasoning, Zeno's paradox proves that a runner can never reach the finish line in a race. But it really only proves that if you measure time in such a way that the finishing time is infinitely far in your future, you will never see him finish. That's obviously a screwy way to measure time in a race, but something similar is happening with the black hole. If you draw coordinate lines in a particular way (corresponding to the inertial frame of an outside observer stationary with respect to the hole) then the time axis bends in such a way that it never crosses the horizon. But there's no reason you have to draw the coordinates that way; there are plenty of others in which the time axis does cross the horizon. -- Greg

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