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TimB's answer is basically what I would write, except for a very small loophole that I'll include here. Any celestial body does not actually orbit another body, but a point in space called the sys...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:40Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/4229 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/