I've just learned that there is actually a tenth planet. Well, of course, there is some controversy. Some people still say Pluto isn't really a planet, so I'm sure there will be arguments about this one for some time to come.
The current, though temporary designation for this celestial body is 2003UB313. The International Astronomical Union first has to decide what this body actually is, and then decide on a name for it. Some have suggested Persephone.
I think they should just call it X.
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