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Other Earths

作者:毛跺    发布时间:2019-03-05 07:19:05    

By Govert Schilling OUR galaxy may contain hundreds of thousands of life-bearing planets, according to a new estimate. This could make the nearest inhabited twin of planet Earth as close as a few hundred light years away. In 1961, the American scientist Frank Drake suggested a simple formula for calculating the number of technologically advanced civilisations in the Galaxy. But the Drake equation contains a number of parameters that are very difficult to estimate,

 

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