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Nice Model

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Encyclopedia of Astrobiology

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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References and Further Reading

  • Gomes R et al (2005) Origin of the cataclysmic Late Heavy Bombardment period of the terrestrial planets. Nature 435:459–461

    Article  ADS  Google Scholar 

  • Morbidelli A et al (2005) Chaotic capture of Jupiter’s Trojan asteroids in the early Solar System. Nature 435:466–469

    Article  ADS  Google Scholar 

  • Tsiganis K et al (2005) Origin of the orbital architecture of the giant planets of the Solar System. Nature 435:462–465

    Article  ADS  Google Scholar 

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Correspondence to Sean N. Raymond .

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© 2011 Springer-Verlag Berlin Heidelberg

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Raymond, S.N. (2011). Nice Model. In: Gargaud, M., et al. Encyclopedia of Astrobiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-11274-4_1058

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