Nine? Eight? Twelve?

So, how many planets are there, really? Pluto, as some of you might know, has been fighting a valiant battle to actually remain in the group of nine planets. A proposal to be hashed out this week would reclassify it as a "pluton" – a small, outer solar system object, but not one of the 8 classical inner planets. And, 3 other plutons are promoted with it – so now there are 12 planets.

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