Comets in the Path of Earth

被引:2
|
作者
Jenniskens, Peter [1 ]
Popova, Olga [2 ]
机构
[1] SETI Inst, 189 Bernardo Ave, Mountain View, CA 94043 USA
[2] Russian Acad Sci, Inst Dynam Geospheres, Leninsky Prospect 38 Bldg 1, Moscow 119334, Russia
关键词
comet; impact; meteor; meteoroid; interplanetary dust; zodiacal cloud; IMPACTORS; AIRBURST; JUPITER; ORIGIN; CLOUD;
D O I
10.2138/gselements.14.2.107
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Earth's atmosphere offers little protection against comet impacts, because many comets are bigger than 1 km. Fewer comets hit Earth than asteroids of the same size, except perhaps for sizes larger than 10 km. Comets release copious amounts of solid debris called meteoroids, and these meteoroids disperse to form meteoroid streams, some of which cause meteor showers on Earth. Recent meteor shower observations reveal the presence of potentially dangerous parent comets and trace their dynamical evolution. In addition, some showers leave a signature of "cosmic dust" in our atmosphere.
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页码:107 / 112
页数:6
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