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Numerous astronomical observations confirm that black holes really exist. The question of what is inside them is a legitimate scientific question. Although we do not know the full answer, the equations of Einstein's theory of gravity give us some clues. At the border of our knowledge, where the known meets the unknown, science is often mixed with fiction. How to separate scientific facts from fantasy and speculation? Dr. Hab. Sebastian Szybka is a professor at the Jagiellonian University, an astrophysicist and cosmologist. He works at the Astronomical Observatory of the Jagiellonian University. He appears regularly on our channel, and has already talked about, among other things, problems with the expansion of the universe and understanding Einstein's theory of relativity, the mathematical nature of the world, black holes, chaos theory, multi-carrier astronomy and interstellar travel. The material was created thanks to funding from the Strategic Program Excellence Initiative at the Jagiellonian University.