summary - For more than 30 years, scientists have argued about a controversial hypothesis relating to periodic mass extinctions and impact craters -- caused by comet and asteroid showers -- on Earth. Now scientists have concluded that mass extinctions occurring over the past 260 million years were likely caused by comet and asteroid showers.
Wednesday, October 21, 2015
Comets, Meteors, Mass Extinction
Science Daily: Scientists find link between comet, asteroid showers and mass extinctions
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