@tcn33 It’s not a planet unless Ceres, Haumea, Makemake, Eris, 2207OR10, Quaoar, Sedna, Orcus, 2002MS4 & Salacia are, too. +prob many more.
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@DrFunkySpoon so if can’t count planets, lose basic distinguishing descriptor of solar system—just sun and some stuff going around it.
5/ @DrFunkySpoon demotes “planet” to lesser importance like comets, asteroids, where each is interesting, but take one away, no biggie.
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@kchangnyt But I do think you're correct that romantic procrustean attachment to historical # of planets motivated dynamical definition.Thanks. Twitter will use this to make your timeline better. UndoUndo
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