Everyone has started to call this new proposed planet X: "Planet nine" as in the original announcement. Even Wikipedia has titled its article on it "Planet Nine". But it’s a poor name for a planet if you think about it. Why not just call it "Planet X"? Or find some new name, like Nemesis and Tyche as was done for previous planet X candidates. None of the previous candidates for Planet X were called Planet + some number, and with good reason. There is no way that we can know it will be planet 9.
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