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Originally posted by RoN_Rancor
I don't think that the earth and moon are considered a two planet system (of couse I could be completely wrong) because wouldn't the earth and the moon have to revolve around each other for that to be the case? (like in binary star systems). Of couse, I don't think pluto's moon does that, and I know that it is considered a binary planet with pluto.
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To be blunt, you
are wrong. Earth and the Moon revolve around a common centre of mass, as do Pluto and Charon.