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RE: Proposed purple prehistoric planet. Possible? Preposterous? Perhaps.
Great work, and a fascinating hypothesis!
When I was almost a kid, I read the Perelandra Trilogy of C.S.Lewis, and there the vegetation on other planets was purple. It seems crazy that this might actually be accurate.
Yeah, it's too interesting to not think about, even if it has a few potential holes. Looking at this and a few other comments, purple planets definitely seems like a scifi trope.