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1. Orbit a high-mass planet In the Solar System, two moons are covered with ice and have subsurface oceans: Europa and Enceladus. Europa orbits Jupiter; Enceladus orbits Saturn. In the case of the...
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2020-06-01T14:13:54Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/106992 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/