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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    JETP letters 68 (1998), S. 163-167 
    ISSN: 1090-6487
    Keywords: 96.20.Dt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The comet hypothesis of the origin of lunar ice, which was recently discovered in the polar regions of the moon by Lunar Prospector, is examined. It is shown that a comet impact produces a temporary atmosphere whose volatile component accumulates essentially completely in cold traps — the permanently shadowed regions of the Moon. The condensation of volatile compounds leads to the formation of ice with a definite chemical and isotopic composition, which contains important information about the composition of the comet. This hypothesis can be checked during the next lunar missions, and if confirmed, definite progress will have been made in understanding the nature of comets.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1090-6487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract After the fragments of comet Shoemaker-Levy 9 fell onto Jupiter, some molecules which were formed as a result of chemical reactions in the shock-compressed gas during the explosion of the comet fragments and ejected into the upper atmosphere by the shock wave were observed in the upper atmosphere. As the initially hot gas expanded, these molecules were quenched. Therefore they represent a kind of “memory” of the shock processes which occurred in the region of generation of the strong shock wave. The radiation from such molecules was registered by both ground-based observers and the Hubble space telescope. In the present paper we estimate the penetration depth and energy of the largest comet fragments on the basis of data on the content of shock-synthesized molecules in Jupiter’s upper atmosphere.
    Type of Medium: Electronic Resource
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