Re: More than a coincidence?
"The orbit of any planet in a solar system with more than one planet is chaotic. (Mathematical fact, mathematical definition of chaotic). Given infinite time, all but one planet will inevitably be ejected into interstellar space (or less likely swallowed by its sun or collided with another planet)."
As far as I remember "chaotic" in the mathematical sense does not mean unstable, it means unpredictable. A chaotic system's future state can only be predicted if you know _exactly_ the initial state. A small (infinitesimal) change in initial state leads to a large and undefined change in future state.