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New evidence found for Planet 9
(phys.org)
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this post was submitted on 25 Apr 2024
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But then why isn‘t Ceres also a Planet? Or Eris? Or Quaoar? Or any of the other objects classified as dwarf planets
The answer is easy: Besides their size, they all behave very differently from the actual Planets. Doesn’t mean they’re any less important, they’re just something slightly different.