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In general, the problem with hollow-Earth setups is that objects in hydrostatic equilibrium cannot be hollow - and planets must be in hydrostatic equilibrium. Planets form through collisions of sma...
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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/63180 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/