Formation of the solar system by instability

Evgeny Griv, Michael Gedalin

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The early gas and dust protosolar nebula of the solar composition is considered analytically. A simultaneous formation of the sun and all the planets around it ( 5 × 109 yr ago) through a local gravitational Jeans-type instability of small-amplitude gravity perturbations in the nebula disk is suggested. It is shown that a collective process, forming the basis of the disk instability hypothesis, solves with surprising simplicity the two main problems of the dynamical characteristics of the system, which are associated with its observed spacing and orbital momentum distribution, namely, Bode's law on planet spacing and the concentration of angular momentum in the planets and mass in the sun. Besides, the analysis is found to imply the existence of new planets or other Kuiper-type belts of comets at mean distances from the sun of 87 AU, 151 AU, 261 AU, 452 AU, 781 AU (Mercury, Venus, . . ., Asteroid belt, . . ., Neptune, Kuiper belt, new planets or other Kuiper-type belts).

Original languageEnglish
Pages (from-to)97-106
Number of pages10
JournalProceedings of the International Astronomical Union
Issue numberIAUC197
StatePublished - 1 Jan 2004


  • Instabilities and waves
  • Planetary formation
  • Planetary systems
  • Solar system

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


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