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Summary It turns out that even relatively low-mass ocean planets are capable of forming some of the exotic ices you name in their cores. Ice VII appears to form at the centers of planets of $0.015...
Answer
#1: Attribution notice removed
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System
·
2020-06-01T14:13:58Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/146660 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/