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No, all dwarf planets are too small to affect orbits the way that hypothetical planet is supposed to do.
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Planet Nine is the new Planet X https://en.wikipedia.org/wiki/Planet_Nine
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Glad that artist's impression was there so I could get a good idea of what Planet 9 may or may not look like.
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there are a few different “Planet X”s theorized

https://en.wikipedia.org/wiki/Planets_beyond_Neptune

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