The debate about Pluto’s planetary status has simmered down, although I was always partial to the way Alan Stern, the Director of New Horizons mission to Pluto, explained it to me: it’s just a dwarf planet. We don’t call a small dog a different species just because they’re small, we just call it a miniature, …

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The distant, icy dwarf planet Pluto gets a new moon, and the new Horizons Mission to Pluto has a new target when it visits the system three years hence: