GRE

简答题 NASA now calculates that the rate of starformation in our galaxy is closerto seven per year than to Drake’s original calculation．If that were theonlychange，how would it affect Drake’s equation?

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C．
Drake suggested that lo stars were formed each year；the real number is 30 percent fewer．Since Drake used that 10 as a factor in his formula， reducing it to 7 would reduce the final figure，number of intelligent civilizations，by 30 percent．

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