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In early May, scientists published a photo of a giant black hole (its mass is 4 million times greater than the mass of our Sun), located in the very center of the Milky Way - our galaxy. This news stirred up the entire Internet space. But why does news about black holes cause us so much emotion? Because black holes are the most mysterious objects in the world. Firstly, information does not reach us from their depths. Secondly, it is difficult to prove that we are dealing with a black hole. We invited astrophysicist, popularizer of science, doctor of physical and mathematical sciences and professor of the Russian Academy of Sciences Sergey Popov to give us a lecture on black holes!