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It seems that where there are several bodies, moons or planets with some mass and gravity in orbit around a primary, they tend to affect each other's orbits in such a way as to circularize all of them. It might be that one of them is left wildly elliptical and that one gathers up energy and gets flung completely out of the system or sent into the primary itself leaving the rest with quieter orbits. Just like people, older neighborhoods tend to be quieter.

Yeah, you're right. I don't think we understand much about about the rotation and orbits of planets. Just looking at the earth science says that our magnetic field is created by the iron core spinning faster than the mantle. If so why does magnetic North wander so unevenly around. There appears to be more than just momentum, angular momentum, and mass involved on the orbits and rotation of planets. It could be that our planet rotates in equilibrium. Maybe the electromagnetism from the sun rotatates our core so that it's force versus the friction of the oceans and the liquid parts of the mantle create a 24 hour day, unable to speed up because of the friction of the liquids mentioned, and unable to slow down because of the electromagnetism of our core and/or the sun. Then there's the spiralness of galaxies and Saturn's rings. Doesn't make sense if there is just gravitation and momentum involved. Just too many inconsistencies for me to accept mainstream sciences explanations for the movement of plantary bodies. I spent the last day looking into some theories but it's just too broadbased to try to make a point on. :^)

The celestial mechanics problems that have been completely solved are very limited and don't represent the system as a whole. Lately computer modelling is giving some pictures of entire systems of good complexity. They throw in everything they can think of, but are they getting all the parameters?. It's similar to the problem of trying to model earth's and other planets' and stars' climates. You can get some results and maybe some inspiration, but really the technology of computer modelling is just in its infancy. How do planetary orbits circularize? Where do galactic spiral arms come from and how do they move? I don't know if there is an employed, working scientist who will say it is definitely this or that. We don't even know if spiral arms move clockwise or CCW. We don't even know they aren't a total artifact of stellar evolution rather than orbital mechanics. Of course, we haven't left our front porch yet, either, so we can't be expected to actually know anything.