And don't think of it as losing a planet. Consider it recognizing that our solar system family carries evidence of its violent formation, and that large round bodies like Ceres, Xena, and Charon, are closer to the millions of comet like formations in the Oort cloud than planets anyway. Yes, Pluto is a comet, or pluton, or whatever they're going to name them. It's composition doesn't change because of the name.
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