
A new mechanism devised to explain how icy bodies from the Oort cloud get past Jupiter and Saturn has revealed that it is unlikely that large cometary showers would havecaused more than one prehistoric extinction event."The chunks of ice and dust that make their home in the Oort cloud, far beyond the orbit of Pluto, sometimes become dislodged and head into the solar system as streaky comets."
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Source: Scientific American.
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