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I think if the planet had an atmosphere that was very thick to keep heat in at ground level, heavy in hydrogen and helium, with a very strong magnetic field to keep solar rays from knocking them aw...
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#1: Attribution notice removed
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System
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2021-03-30T23:53:18Z (over 3 years ago)
Source: https://worldbuilding.stackexchange.com/a/71866 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/