THE OORT CLOUD

被引：65
|
作者：
WEISSMAN, PR
机构：
[1] Earth and Space Sciences Division, Jet Propulsion Laboratory, Pasadena, CA 91109
来源：
NATURE | 1990年 / 344卷 / 6269期
关键词：
D O I：
10.1038/344825a0
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Although the outermost planet, Pluto, is 6×l09km from the Sun, the Sun's gravitational sphere of influence extends much further, out to ∼2×1013 km. This space is occupied by the Oort cloud, comprising 1012×1013 cometary nuclei, formed in the primordial solar nebula. Observations and computer modelling have contributed to a detailed understanding of the structure and dynamics of the cloud, which is thought to be the source of the long-period comets and possibly comet showers. © 1990 Nature Publishing Group.
引用
收藏
页码：825 / 830
页数：6
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