Computer Science
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989em%26p...47...33n&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 47, Oct. 1989, p. 33-50.
Computer Science
3
Chemical Composition, Comet Nuclei, Interstellar Matter, Refractory Materials, Silicates, Annealing, Cosmic Rays, Hydration, Interstellar Chemistry, Metamorphism (Geology)
Scientific paper
Characteristics which might be observed in silicate grains from a cometary nucleus are examined on the basis of theoretical studies of the life cycle of refractory grains and laboratory experiments using simple analogs to the complex natural system. The life-cycle of a typical silicate grain is reviewed from condensation in a circumstellar outflow to incorporation into a cometary parent body. The possibility for grain metamorphism in the cometary environment is discussed and results are presented from experiments on the properties of interstellar grains. Also, consideration is given to the information about presolar refractory grains that might be gained from studying samples returned from a cometary nucleus.
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