{"id":19553,"date":"2021-11-25T13:58:47","date_gmt":"2021-11-25T12:58:47","guid":{"rendered":"https:\/\/us.edu.pl\/wydzial\/wnst\/?p=19553"},"modified":"2022-05-06T13:56:59","modified_gmt":"2022-05-06T11:56:59","slug":"czarne-dziury","status":"publish","type":"post","link":"https:\/\/us.edu.pl\/wydzial\/wnst\/en\/2021\/11\/25\/czarne-dziury\/","title":{"rendered":"Black Friday or Black holes | Jan S\u0142adkowski, Prof"},"content":{"rendered":"

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26 November<\/span><\/small><\/strong><\/p>\n

black friday<\/span><\/small><\/strong><\/p>\n

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\u201eSave the date”<\/a> is a series of articles that have been written to celebrate various unusual holidays. The authors of the presented materials are students, doctoral students and employees of the Faculty of Science and Technology of the University of Silesia.<\/p>\n<\/div>\r\n <\/div>\r\n <\/div>[vc_separator color=”custom” accent_color=”#9b132a”]\r\n

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On the occasion of Black Friday, we invite you to read a short article by Prof. Jan S\u0142adkowski from August Che\u0142kowski Institute of Physics about the most black phenomenon that humanity has discovered – not only on Friday.<\/p>\n<\/div>\r\n <\/div>\r\n <\/div>[\/vc_column][\/vc_row][vc_row css=”.vc_custom_1629883969954{margin-bottom: 0px !important;border-bottom-width: 0px !important;padding-bottom: 0px !important;}” el_class=”shadow”][vc_column width=”1\/3″ el_class=”foto”][vc_column_text el_class=”foto” css=”.vc_custom_1637866742064{padding-right: 20px !important;padding-left: 20px !important;}”]\"PrzybylaKasperek\"<\/p>\n

Fot. Katarzyna Balin<\/em>[\/vc_column_text]\r\n

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Prof. Jan S\u0142adkowski<\/strong><\/small><\/span><\/p>\n

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Institute of Physics<\/p>\n<\/div>\r\n <\/div>\r\n <\/div>[\/vc_column][vc_column width=”2\/3″]\r\n

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Today we have the so-called Black Friday. Unfortunately, when someone falls into the vortex of promotional purchases, it is extremely difficult to get out of it! Physicists also know objects that can completely take over the observer. We refer to them by the term black holes. Roughly speaking, a black hole is a region of spacetime in which gravity is so strong that nothing – not even light – can leave it. The idea that a gravitational field could be strong enough to trap even light was born in the 18th century in the minds of (independently) John Mitchell (1784) and Pierre-Simon Laplace. In 1916, Karl Schwarzschild found a solution to Einstein’s equations that describes a region of spacetime having an interpretation of a black hole. Initially, they were considered a mathematical curiosity. Today we have many convincing observations that such objects do exist. For example, an imbalance between gravitational forces and nuclear reactions in a massive star can lead to it collapsing and creating a black hole. Here are some features of black holes:<\/p>\n