Why two astronomers think we have a ninth planet | Popular Science - discu.eu

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A mysterious ninth planet could be lurking beyond Pluto https://www.popsci.com/science/planet-solar-system-kuiper-belt/ 40 comments 13/9/2023 space

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Astronomers still haven’t decided if Planet 9 is real | Popular Science https://www.popsci.com/science/is-planet-9-real/ 0 comments

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