Renaming and adding planets

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From what I was able to gather, it's because Pluto and it's moon sort of orbit each other. The center of gravity between those objects is out in space between them, unlike with Earth and its moon. In our case, the center of gravity is actually beneath the surface of the Earth. Apparently that has something to do with whether an object is technically a moon or a planet. Another way of putting it is that Pluto's moon is nearly as big as Pluto, so it's not so much a moon as it is a co-planet.
 
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Originally posted by Matt_S:
From what I was able to gather, it's because Pluto and it's moon sort of orbit each other. The center of gravity between those objects is out in space between them, unlike with Earth and its moon. In our case, the center of gravity is actually beneath the surface of the Earth. Apparently that has something to do with whether an object is technically a moon or a planet. Another way of putting it is that Pluto's moon is nearly as big as Pluto, so it's not so much a moon as it is a co-planet.

I think I saw a documentary that showed that they sorta time-share the actual orbital path and appear to slingshot each other in the "trading places" (IIRC)
 
I don't see why they shouldn't, various 'followings' have changed their history to suit current events - astronomers can change the naming of planets.

urectus delecti
 
In flagranti?
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