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Nice 2 model
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<p>The Nice 2 model is a model of the early evolution of the <a href="/facts/Solar_System/QIcLSazQ">Solar System</a>. The Nice 2 model resembles the <a href="/facts/Nice_model/Mv0ADIy8">original Nice model</a> in that a late instability of the outer Solar System results in gravitational encounters between planets, the disruption of an outer <a href="/facts/Planetesimal/PK60dofs">planetesimal</a> disk, and the migrations of the <a href="/facts/Outer_planets/QIcLSazQ">outer planets</a> to new orbits. However, the Nice 2 model differs in its initial conditions and in the mechanism for triggering the late instability. These changes reflect the analysis of the orbital evolution of the outer Solar System during the <a href="/facts/Protoplanetary_disk/FtfSbP61">gas disk</a> phase and the inclusion of gravitational interactions between planetesimals in the outer disk into the model. </p>