Realm of the comets

Details Realm of the comets Realm of the comets

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987s%26t....73..238w&link_type=abstract

Sky and Telescope (ISSN 0037-6604), vol. 73, March 1987, p. 238-241.

Astronomy and Astrophysics

Astronomy

Astronomical Models, Comets, Solar Orbits, Solar System, Halley'S Comet, Jupiter (Planet), Meteorites, Oort Cloud, Perturbation Theory, Comets, Halley, Oort Cloud, Popular, History, Theoretical Studies, Long Period Comets, Origin, Source, Orbits, Energy, Perturbations, Dynamics, Models, Gravity Effects, Cretaceous-Tertiary Event, Iridium, Microtektites, Extinction, Sediments, Anomalies, Evolution, Astronomy

Scientific paper

Studies of Jovian perturbations of the orbits of long-period comets led to the concept of the Oort cloud of 180 billion comets at 50,000-150,000 AU from the sun. Several comets are induced to move toward the sun every million years by the passage of a star at a distance of a few light years. The location of the cloud has since been revised to 20,000-100,000 AU, and comets are now accepted as remnant material fron the proto-solar system epoch. The galactic disk and random, close-passing stars may also cause rare, large perturbations in the orbits of the cloud comets, sending large numbers of comets through the inner solar system. The resulting cometary storm is a candidate cause for the wholesale extinction of dinosaurs in the Cretaceous-Terniary transition due to large number of planetesimals, or one large comet, striking the earth, in a short period of time. The IRAS instruments have detected similar clouds of material around other stars.

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