Eli5: How do blackholes form and exist?
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Lets say we have a star. This star produces heat through a process called nuclear fusion, in which two smaller nuclei come together to form a more dense nucleus. This process creates a force that pushes outwards. This force will also push outwards with the exact same force as gravity pushes in on the star with. Since these two forces are equal, they cancel each other out and the star remains at a constant size. However, when the star dies, the fusion process slows down before stopping, and the gravitational force that pushes inwards is able to compresses the star. If the star is big enough, this will compress it to an incomprehensibly small point, where it becomes a black hole.
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