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Originally Posted by Theodoric
Possibly because it, and also Pluto, should be considered as Kuiper Belt Objects rather than true planets; definitely B list astronomical bodies.
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From what I've read, that is a minority opinion amongst astronomers. Sedna (if indeed that is what it's eventually called) was announced a couple of years ago but they waited until all the arguing was over before confirming it as a planet. It
is a planet, as is Pluto (which is a smaller body).