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Keeping in mind the object with the larger mass will (over those millions of years) pull the smaller object closer in all dimensions/planes
It's still hard for me to get my head around, it would be great to see an animation showing this with perhaps 3 or 4 objects. It's especially hard for me to visualize the gas cloud around a star coelescing into a plane, even before the more solid objects form.
Is this because of rotational mechanics around the star?
So, the star and planets all started as one big gas nebula, then the nebuka as a whole started spinning due to uneven distribution of matter within the cloud as it condensed. This spin increased over time and as the sun formed in the center, and planets clumped around in its orbit. The spin relative to each other, along with some interesting collisions between massive bodies, is why a few don't fit the general mold of spinning the same ways on the same plane. We may have even picked up a planet or two over time that was ejected from another solar system!
This video does an ok job of explaining the spinning and planet formation part. I'm sure thete are better ones out there.
https://m.youtube.com/watch?v=sCkhEu3lYNc
It’s like how the earth bulges out at the equator.
The momentum pulls them out, gravity pulls it back. Similar thing at the solar and galactic planes.
They “bulge” relatively to the spin of the material over time and the clumps of material then forms planets along that general plane.
From the aboves video you can see this at 44seconds
https://www.youtube.com/watch?v=sCkhEu3lYNc&t=44s
And a relevant PBS Spacetime video
Why is the Earth Round and the Milky Way Flat? | Space Time | PBS Digital Studios
But the biggest reason is the way gasses form in space. As noted in the above video at the 8:45 mark. Gasses aren’t able to fall back into the center along their axis of spin because of their momentum. But the gassed above and below the plane can move towards the gathering material there by gravity and so it flattens out.
https://youtu.be/Aj6Kc1mvsdo?t=8m45s
Ah, that makes sense.
Once you have a slight more mass in any plane, eventually everything will move to that plane.