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#pluto #dwarf planet #IAU definition #planet reclassification #solar system debate #astronomy classification #ninth planet debate

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#pluto demoted #dwarf planet #IAU definition #planet reclassification #2006 science

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#pluto #ninth planet #former ninth planet #dwarf planet #planet definition debate #astronomy controversy #IAU definition

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#not a planet #IAU definition #planet classification #solar system object