Definition
The so-called Nice model is a model for the dynamical evolution of the outer Solar System. In this model, the giant planets underwent a dynamical instability several hundred million years after the planets formed, which played a major role in shaping the present-day Solar System. The Nice model can explain several observations in the Solar System, including the orbits of the giant planets, several small body populations (e.g., Jupiter’s Trojans), and the late heavy bombardment.
Overview
The Nice model makes the assumption that the giant planets formed in a more compact configuration than their current one, with Jupiter and Saturn closer than their 2:1 mean motion resonance. The model also assumes that exterior to Neptune there existed a massive primordial disk of small bodies (planetesimals), totaling perhaps 50 Earth masses. The long-term evolution is thought to have proceeded as follows. Over time, Neptune’s gravity perturbed the orbits of nearby planetesimals onto...
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