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Pluto should be our ninth planet. A planetary scientist explains whyAstronomers believe they’re closing in on the so-called Planet Nine, but planetary scientist Paul Byrne argues our official definition of what is and isn’t a planet is in need of a long-overdue shake up. 2023-6-11 11:40pm BBC Science Focus Magazine Paul Byrne 2,000 words Rated 2023-6-13 10:52am
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