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Have you considered a Sitnikov planet? Image courtesy of Scholarpedia user Christoph Lhotka under the Creative Commons Attribution-ShareAlike 3.0 License. A Sitnikov planet moves on an axis, pe...
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#1: Attribution notice removed
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2020-06-01T14:13:48Z (almost 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/39299 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/