Abstract Comets are known to contain ices, organic compounds, and silicate dust grains. During final accretion by the early Earth, comets will have contributed chemical ingredients in several ways: as bulk additions to the volatile inventory; as particles, molecules, radicals, and atoms; and perhaps in rare cases as localized concentrated matter. Having originated in the outer solar system and/or interstellar space, these constituents are, not surprisingly, unique compared to those otherwise found at the surface of the early Earth. Comets are apparently rich in materials that may be vital to successful prebiotic evolution, including light elements, catalytic elements, organic compounds, and microparticles of various types down to the submicrometer size range. Because of their exceptional chemical nature and great abundance, comets deserve serious consideration in models of accretion and early protobiological activity.
Comets as a source of preformed material for prebiotic evolution
Advances in Space Research ; 9 , 2 ; 87-90
01.01.1989
4 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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