<p>As I get along with the answers in my previous <a href="https://astronomy.stackexchange.com/questions/48295/which-planet-came-first-in-our-solar-system">question</a>, that planet formation depends on accumulation of planetesimals. So is there any chance that a planet nine would form or any of the <a href="https://en.wikipedia.org/wiki/Trans-Neptunian_object" rel="nofollow noreferrer">Trans-Neptunian Object</a>, &quot;evolve&quot; into a planet in or near <a href="https://en.wikipedia.org/wiki/Kuiper_belt" rel="nofollow noreferrer">the Kuiper Belt, which is thought to be a belt of planetesimals</a>?</p>
<p>Although we don't know fully about the Kuiper belt, what can we conclude from the information and models we have now.</p>
<p><a href="https://www.space.com/16080-solar-system-planets.html" rel="nofollow noreferrer">https://www.space.com/16080-solar-system-planets.html</a></p>

CC BY-SA 4.0
2022-01-25T15:42:57.673Z
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
CC BY-SA 4.0
2022-01-25T16:03:58.693Z
@PM2Ring I agree !
Kavin Ishwaran
CC BY-SA 4.0
2022-01-26T05:23:14.033Z
The largest TNOs are still dwarf planets. Search for 'hypothetical ninth planet' here to have a more insight.
Nilay Ghosh
CC BY-SA 4.0
2022-01-26T23:23:10.023Z
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
CC BY-SA 4.0
2022-01-27T00:04:51.547Z
The question specifies formation in the Kuiper belt.
ProfRob
<solar-system><planetary-formation>
Could or has a Ninth planet ever be "formed" in our solar system?
Kavin Ishwaran
# Could or has a Ninth planet ever be "formed" in our solar system?

(Asked by: username_0 on 2022-01-25)

As I get along with the answers in my previous [question](https://astronomy.stackexchange.com/questions/48295/which-planet-came-first-in-our-solar-system), 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](https://en.wikipedia.org/wiki/Trans-Neptunian_object), "evolve" into a planet in or near [the Kuiper Belt, which is thought to be a belt of planetesimals](https://en.wikipedia.org/wiki/Kuiper_belt)?

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>

**Tags:** solar-system, planetary-formation

> **Comments:**
> **username_1**: 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.  
> **username_0**: @PM2Ring I agree !  
> **username_2**: The largest TNOs are still dwarf planets. Search for 'hypothetical ninth planet' here to have a more insight.  
> **username_3**: 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.  
> **username_4**: The question specifies formation in the Kuiper belt.  

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