Possible cometary origin of heavy noble gases in the atmospheres of Venus, earth, and Mars

Details Possible cometary origin of heavy noble gases in the atmospheres of Venus, earth, and Mars Possible cometary origin of heavy noble gases in the atmospheres of Venus, earth, and Mars

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.358...43o&link_type=abstract

Nature (ISSN 0028-0836), vol. 358, no. 6381, July 2, 1992, p. 43-46. Research supported by NASA.

Computer Science

59

Comets, Earth Atmosphere, Mars Atmosphere, Rare Gases, Venus Atmosphere, Atmospheric Composition, Chassignites, Hypervelocity Impact, Ice, Nakhlites, Shergottites

Scientific paper

Due consideration of the probable history of the Martian atmosphere, as well as noble-gas data from the Mars-derived SNC meteorites and from laboratory tests on the trapping of noble gases in ice, are the bases of the presently hypothesized domination of noble gases in the atmospheres of all terrestrial planets by a mixture of internal components and a contribution from comets. If verified, this hypothesis would underscore the significance of impacts for these planets' volatile inventories. The sizes of the hypothesized comets are of the order of 120 km for Venus and only 80 km for that which struck the earth.

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