Physics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.3263m&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Dec. 1989, p. 3263-3271.
Physics
9
Comet Nuclei, Cosmochemistry, Physical Properties, Interstellar Matter, Oort Cloud, Organic Compounds
Scientific paper
Comets are not necessarily pristine nebular and interstellar material, despite a common perception to that effect. Alteration processes may occur during comet formation in the outer planet region, during their dispersal to or residence within the Oort cloud, and after their return to the planetary region. Processes that may have significantly modified cometary nuclei include heating, impacts, and irradiation. Possible consequences include phase changes in ices, hydration reactions in silicates, synthesis of organic compounds, collisional disruption and re-accretion, shock and irradiation effects in minerals and ices, cosmogenic nuclide formation, redistribution or loss of volatiles, and formation of a refractory veneer. A model of cometary nuclei that emerges from these considerations provides a framework for understanding observations of comets and future samples.
McSween Harry Y. Jr.
Weissman Paul R.
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