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Nugatory

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To properly understand black holes and why the Schwarzschild radius is what is, you have to start with the Schwarzschild solution to the Einstein field equations. You'll find many threads here if you search for "black hole escape velocity".

- #3

fresh_42

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I've also found a funny calculation of the corresponding radii for objects the mass of our sun and a proton which you can compare your result to:

https://books.google.de/books?id=5d...ge&q=schwarzschild radius of a proton&f=false

Unfortunately the book quotation doesn't show how to assess these results, as it's not for free.