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Possible cometary origin of heavy noble gases in the atmospheres of Venus, earth, and MarsDue 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.
Document ID
19920065129
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Owen, Tobias
(Hawaii, University Honolulu, United States)
Bar-Nun, Akiva
(NASA Headquarters Washington, DC United States)
Kleinfeld, Idit
(Tel Aviv University Israel)
Date Acquired
August 15, 2013
Publication Date
July 2, 1992
Publication Information
Publication: Nature
Volume: 358
Issue: 6381,
ISSN: 0028-0836
Subject Category
Lunar And Planetary Exploration
Accession Number
92A47753
Distribution Limits
Public
Copyright
Other

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