by:SINA.com
Ancient times comets "shelling"Earth resulted in substantial species extinctionSina technology - The May 6, according to foreign media reports, a new study claims that the solar system through the Milky Way's "Spring"movement on a regular basis so that speeding toward the comet within the solar system, the collision between the comet can be explained in ancient A lot of life on Earth extinct. The study showed that the comet "shelling"and the solar system too ....
original link:http://tech.sina.com.cn/d/2008-05-06/14502178744.shtml
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