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Pluto’s Planetary Fate? Not Great

In 2006, the International Astronomical Union kicked Pluto off its planetary pedestal. In his delightful book How I Killed Pluto and Why It Had It Coming (Bookshop|Amazon) astronomer Mike Brown recounts the events leading up to the demotion of that celestial body and the controversy over the definition of the word planet. The resulting change in nomenclature was such big news worldwide that, in a run-off against the term climate canary, the American Dialect Society voted the neologism plutoed its 2006 “Word of the Year.” The word planet derives from the Greek word planētēs (πλανήτης) which means “wanderer.” This is part of a complete episode.

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