Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13.1482m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 13, Dec. 1986, p. 1482, 1483.
Physics
5
Atmospheric Entry, Comets, Upper Atmosphere, Dayglow, Dust, Evaporation, Ocean Bottom, Sediments, Snow, Solar Orbits, Water
Scientific paper
The theory of a large influx of small comets composed of water snow (Frank et al., 1986) is found to be untenable because: (1) the comets would evaporate within a few periods, and could not be insulated by the limited dust and carbon content of the comets determined by measurements of cosmic material in deep sea sediments; (2) these measurements constrain the dust content of the suggested small comets below that of known comets; (3) the sublimation rate at about 1 AU would not permit survival over the age of the solar system of small comets in orbit with semimajor axes of less than 300 AU; and (4) the known orbital dynamics of comets in larger orbits is inconsistent with the suggestion that the proposed comets be confined to long period prograde orbits in the neighborhood of the ecliptic.
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