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The idea of an ocean planet isn't too far-fetched. There are several moons in the Solar System - Enceladus and Europa, for instance - that have subsurface oceans. If the ice covering their surfaces...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:54Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/102444 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/