> But aren't the vast majority of possible orbits unstable? No. Ignoring perturbations from other planets, planetary orbits are stable ellipses with the sun at

> But aren't the vast majority of possible orbits unstable? No. Ignoring perturbations from other planets, planetary orbits are stable ellipses with the sun at one focus. http://en.m.wikipedia.org/wiki/Kepler's_laws_of_planetary_motion http://en.m.wikipedia.org/wiki/Kepler's_laws_of_planetary_mo...