| タイトル | Comet showers as a cause of mass extinction |
| 著者（英） | Keller, Gerta; Kauffman, Erle G.; Weissman, Paul R.; Shoemaker, Eugene M.; Hansen, Thor; Elder, William P.; Hut, Piet; Alvarez, Walter |
| 著者所属（英） | California Univ.|Institute for Advanced Study|Colorado Univ.|Jet Propulsion Lab., California Inst. of Tech.|Princeton Univ.|Geological Survey|University of Western Washington |
| 発行日 | 1987-09-10 |
| 言語 | eng |
| 内容記述 | Three independent pieces of evidence supporting a connection between comet showers and clustering in terrestrial cratering and mass extinctions are presented. The temporal profile of a comet shower triggered by a star passing through the Oort cloud is calculated. Four weak peaks are found in the age of distribution of impact craters over the past 100 Myr, as well as two compact clusters of ages of impact glass broadly coincident with crater-age peaks. Recent paleontological observations are reviewed that indicate a stepwise character for some well-documented mass extinctions in the past 100 Myr which roughly coincide with three of the four peaks in crater ages and which have a duration compatible with comet shower predictions. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 88A12756 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/374464 |
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