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Assuming that you are right that a large moon could actually gets Mars tectonic and magnetic system working again... (which is an interesting idea) So after merging Phobos and Deimos and getting th...
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#1: Attribution notice removed
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System
·
2021-03-30T23:53:18Z (over 3 years ago)
Source: https://worldbuilding.stackexchange.com/a/62765 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/