Given enough time, can a new planet form in our solar system?

[cupoftea]

So as the title says, given enough time, can enough material from for example the Kuiper belt melt together and form a new rockplanet? Maybe with water given that alot of those asteroids and planetoids are made of ice. I'm pretty sure that's how our planets formed so..

[Agent Miles]

There may be 100 Earth sized objects in the Kuiper belt and they may be more rock than ice.

When the Sun has fused most of its hydrogen to helium, it will start fusing helium and its outer layers will expand to an enormous diameter, perhaps to the orbit of the Earth. The present gas giant planets will be stripped of their outer layers by energized solar wind and the inner rock cores will be exposed. So there will be new rocky planets where once there were gas giants.

Stars lose mass over their lifetimes. Planets that were once held gravitationally may become rogue and wander the galaxy. Given enough time, such a rogue planet may also enter our own solar system.

[Gordon Freynman]

So as the title says, given enough time, can enough material from for example the Kuiper belt melt together and form a new rockplanet? Maybe with water given that alot of those asteroids and planetoids are made of ice. I'm pretty sure that's how our planets formed so..

I may be possible but would take a very long time since there is much less material left over from when the first planets formed. It's more likely that Ceres would accrete the material in the asteroid belt and eventually become a full fledged planet, than even a new dwarf planet forming from the material in the Kuiper Belt.

[Tacitursa]

I guess it's possible but its very unlikely it would have a magnetic field and thus no atmosphere so just a useless rock bassically. If it contained lots of water it could be used as a spacestation or fueling platform

[B5C]

Chances are probably not. There is not enough material in the Asteroid belt to create an Earth or bigger sized planet. Also note the gravitational pulls from Jupiter and the Sun does not help as well.

[Phier]

If something were to greatly disturb the gravity in our solar system, the old 'rogue star' thing, then its possible that some major collisions could form another outlying planet or smash a few of those in our solar system and form new planets from the mess.

Without that its unlikely that there are enough bodies still in collision orbits which haven't already collided in the last several billion years.

[Godfrey I of Leuven]

Yeah sure, with a little help of terraforming lol

[Jack04]

I seem to remember that the matter density of the Kuiper belt is too low for planet forming and the asteroid belt suffers too much gravitational influence from the combination of Jupiter and the Sun for either locations to be suitable for the creation of new planets.

[John I Tzimisces]

well, there's two big things that keep something like this from happening.

First, there's not enough random material flying around in any particular place to form a large object over millions of years of coalescing. The asteroid belt sorta kinda does, but it's preventing from doing so because of the destabilizing effect jupiter's (immense) gravity has. This is why you only really see the largest object in the asteroid belt being Ceres, which isn't very big at all.

Second, in the kuiper belt, while there might be a whole lot of material, it's spread out over an utterly enormous amount of space going in all sorts of directions. If it was all in a disk shape, like the accretion disk was when the solar system was forming, then it'd be more likely things would lump together, but since that's not the case, objects the size of pluto or slightly larger, on very eccentric orbits, are more likely (to be found or perhaps eventually created).

[Del Valle]

Its been more than 4 billion years since the formation of the solar system. If something hasn't formed yet, I doubt it will in the near future.