Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977amsci..65..299f&link_type=abstract
American Scientist, vol. 65, May-June 1977, p. 299-309. NASA-supported research.
Astronomy and Astrophysics
Astronomy
1
Chemical Composition, Comets, Astronomical Models, Cosmology, Free Radicals, Interstellar Matter, Spectrum Analysis
Scientific paper
Questions concerning the origin of comets are considered. It is pointed out that the molecular composition of a dense interstellar cloud appears to have exactly the composition needed to produce the observed features of the visible cometary spectrum, which consists mainly of emission bands of unstable free radicals. A working model of cometary structure is discussed together with the classical observations which have led to it. The discussed model was originally described by Whipple (1951). It is emphasized that the model can serve only as a rough guide in efforts to interpret the evolution of cometary behavior. A survey is provided of new techniques which have only recently been applied to cometary observations, taking into account the spectrum of a comet, radio observations, and ultraviolet observations.
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