The small-comet hypothesis.

Details The small-comet hypothesis. The small-comet hypothesis.

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991rvgeo..29q.355d&link_type=abstract

Reviews of Geophysics, Vol. 29, No. 3, p. 355 - 382

Physics

Geophysics

Scientific paper

According to the small-comet hypothesis, small comets strike the Earth approximately 20 times per minute, each small comet nominally containing 100 tons of water-ice. The primary observations interpreted as evidence for these small comets are dark spots in the Earth's atomic-oxygen UV dayglow seen by the UV imager on the Dynamics Explorer satellite. These small comets must disintegrate near Earth and then sublimate within a few seconds, the water vapor expanding to form clouds of water vapor, nominally 50 km in diameter, that temporarily block the spacecraft's view of the dayglow, thus producing the dark spots. In this review the author examines problems in basic mechanisms underlying the small-comet hypothesis. These include inconsistencies with known geophysical phenomena, conflicting results from independent searches for evidence of the presence of small comets, and inconsistencies within the small-comet hypothesis itself.

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