I saw this today and I thought it was pretty cool! I don’t think it classifies as a planet since it’s way smaller than Pluto, but still neat nevertheless.
https://www.space.com/astronomy/solar-system/astronomers-discover-a-cosmic-fossil-at-the-edge-of-the-solar-system-is-this-bad-news-for-planet-9
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Pluto was declassified as a planet because of its rotation, not its size.