Questions regarding the Nice Model of the Solar System's evolution.

Questions regarding the Nice Model of the Solar System's evolution. The Nice Model is a model for the early Solar System's evolution. It is predicted that the order of the gas giants was originally Jupiter, Saturn, Neptune, Uranus, but after Jupiter and Saturn were locked in a 1:2 resonance, Uranus and Neptune's orbits were greatly perturbed, causing most of the material in the outer disk of the Sun to be ejected, leaving behind the Scattered Disk and Kuiper Belt.