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Title:
Comets. 2: Models, evolution, origin and outlook
Authors:
Festou, M. C.; Rickman, H.; West, R. M.
Affiliation:
AA(Observatoire Midi-Pyrenees, Toulouse, France), AB(Observatoire Midi-Pyrenees, Toulouse, France), AC(European Southern Observatory, Garching, Germany)
Publication:
Astronomy and Astrophysics Review (ISSN 0935-4956), vol. 5, no. 1-2, p. 37-163 (A&ARv Homepage)
Publication Date:
00/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL MODELS, COMET NUCLEI, COMET TAILS, COMETARY ATMOSPHERES, COMETS, EVOLUTION (DEVELOPMENT), ASTEROIDS, DEPOSITION, OORT CLOUD, OUTGASSING, PHOTOLYSIS, SPECTRUM ANALYSIS, SUBLIMATION
DOI:
10.1007/BF00872923
Bibliographic Code:
1993A&ARv...5...37F

Abstract

In Part 2 of this paper we comment on the modeling 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, and we summarize some of the current thoughts about the nature of the elusive cometary nucleus. 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. Although their origins are still not well known, comets undoubtedly carry important clues to the early history and evolution of the solar system. 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.
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