Mathematics – Logic
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.227..863b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 227, Aug. 15, 1987, p. 863-885. SERC-supported research
Mathematics
Logic
15
Comets, Density (Mass/Volume), Extinction, Oort Cloud, Planetary Evolution, Geological Surveys, Meteoroid Showers, Molecular Clouds, Signal To Noise Ratios, Comets, Periodicity, Cycles, Hypotheses, Time Scale, Oort Cloud, Origin, Formation, Perturbations, Density, Theroretical Studies, Bombardment, Extinction, Calculations, Frequency, Intensity
Scientific paper
It is shown that comet showers with a mean interval of ≅30 Myr cannot be produced using perturbations of the Oort cloud by known stars or molecular clouds unless the currently accepted mass density of these bodies is much too low. This applies whether or not the showers are periodic. It is conceivable that hypothetical dark material might produce a sufficient rate of strong, close encounters, but the existence of bodies with the required masses and mass density seems most unlikely. If there is indeed an apparent 30-Myr periodicity in the mass extinction and geological records, the authors argue that astronomically induced processes are unlikely to be the primary cause.
Bailey Mark E.
Wilkinson D. A.
Wolfendale Arnold W.
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