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The Astronomy and Astrophysics Review

, Volume 5, Issue 1–2, pp 37–163 | Cite as

Comets

II. Models, evolution, origin and outlook
  • M. C. Festou
  • H. Rickman
  • R. M. West
Article

Summary

In Part II of this paper we comment on the modelling of the complex interactions which take place in cometary comae and tails between parent molecules, radicals, ions, dust grains and the solar electromagnetic and corpuscular radiation (Sect. 4), and we summarize some of the current thoughts about the nature of the elusive cometary nucleus (Sect. 5). Comets are ephemeral phenomena whose lifetimes are short on the cosmic scale; their evolution, statistically and as individual objects, is a main theme in contemporary research (Sect. 6). Although their origins are still not well known, comets undoubtedly carry important clues to the early history and evolution of the solar system (Sect. 7). Finally, we mention the main questions now being asked by cometary studies and illustrate some of the future observational possibilities which may provide crucial data for the next steps forward (Sect. 8).

Key words

Comets 

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • M. C. Festou
    • 1
  • H. Rickman
    • 2
  • R. M. West
    • 3
  1. 1.Observatoire Midi-PyrénéesAv. Edouard Belin 14ToulouseFrance
  2. 2.Astronomiska ObservatorietUppsalaSweden
  3. 3.European Southern ObservatoryGarchingGermany

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