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Black holes are cosmic objects bounded by the so-called event horizon, which separates our world from the world below this horizon. Despite the fact that no information can get out from under the event horizon, we have a very good theoretical idea of what it looks like under this horizon and in its immediate vicinity. Ing. Petr Dvořák, Ph.D. is a researcher and university pedagogue working at the Central European Institute of Technology CEITEC and at the University's FSI