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As I get along with the answers in my previous question, that planet formation depends on accumulation of planetesimals. So is there any chance that a planet nine would form or any of the Trans-Neptunian Object, "evolve" into a planet in or near the Kuiper Belt, which is thought to be a belt of planetesimals?

Although we don't know fully about the Kuiper belt, what can we conclude from the information and models we have now.

https://www.space.com/16080-solar-system-planets.html

Fred
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Kavin Ishwaran
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    As far as we know, there's not a lot of matter in the Kuiper belt, and it's mostly spread very thinly. Bear in mind that our Moon is almost 6 times heavier than Pluto. OTOH, it was kinda surprising when we discovered several largish trans-Neptunian bodies, so there could be more stuff hiding out there in the dark. – PM 2Ring Jan 25 '22 at 15:42
  • @PM2Ring I agree ! – Kavin Ishwaran Jan 25 '22 at 16:03
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    The largest TNOs are still dwarf planets. Search for 'hypothetical ninth planet' here to have a more insight. – Nilay Ghosh Jan 26 '22 at 05:23
  • Do not assume the planets of our solar system have always occupied the orbits they current have. Years ago I came across information that mentioned that Jupiter was once closer to the Sun & it moved to its current orbit. If the mysterious ninth planet exists it might have formed closer in & got flung out to a more distance orbit. – Fred Jan 26 '22 at 23:23
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    The question specifies formation in the Kuiper belt. – ProfRob Jan 27 '22 at 00:04

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