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What could be learned? There are so many things you could study by looking at a black hole. There are lots of open or partially unsolved problems that surround them: Does Hawking radiation exist...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:50Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/62680 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/