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For questions about the history of the genre: the origin and evolution of ideas in speculative fiction. Example topics include the first work of speculative fiction with a particular property, or the origin of a term or trope.
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Accepted
What was the literary origin of the idea that in the far future the moon would get closer to...
As mentioned in the comments above, I think that the ultimate source of this idea is scientific. Because of the gravitational interaction of the Earth's tidal bulge with the Moon, angular momentum is …