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by vikingerik
318 days ago
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Note that the "Earth-sized" condition in there is doing some heavy lifting. Earth is a factor of 40x more massive than the largest moon in our solar system. A body needs to be fairly close to Earth's mass to have enough gravity to retain liquid water on its surface. Not that it couldn't happen, but we currently don't have any known precedent for a moon that large. |
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It'd be easy to have a world covered in ice with underwater oceans kept liquid by volcanic vents.