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The Nice model (pronounced to rhyme with peace, for Nice, France, where the model was developed in 2005) is a model of the history of the solar system regarding the dynamics of the planets. It aims to explain the position of the planets and other solar system features such as the asteroid belt, the Kuiper Belt, and the Oort Cloud, as well as the solar system's late heavy bombardment (LHB). It theorizes an outward planetary migration of the four giant planets, triggered by interactions with a much larger population of comet-like planetoids just beyond the planets forming a much larger and more massive belt than currently present.