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A comment on The Nobel Prize in Physics 2020. Parent comment
http://visualrelativity.com/LIGHTCONE/schwarzschild.html
And here's a more technical one:
https://en.wikipedia.org/wiki/Penrose_diagram#Black_holes
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http://visualrelativity.com/LIGHTCONE/schwarzschild.html
And here's a more technical one:
https://en.wikipedia.org/wiki/Penrose_diagram#Black_holes