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Schwarzschild's Solution to Einstein's Equation Implies the Existence of a Black Hole
Einstein's equation implies the existence of something called a black hole. Nobody appreciated that at the time. They didn't appreciate it really until the 1950s or 60s. This lesson about the coordinates being human inventions hadn't quite sunken in. These days we know you can pick better coordinates and you can go past R equals 2GM and you can going into the black hole.