BBC纪录片《寻找外星生命：德雷克公式 The Search for Life The Drake Equation 2010》英语外挂英字-高清完整版下载
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能否通过数学公式推断外星文明存在的可能性。美国天文学家法兰克·德雷克（Frank Drake）在1960年代提出方程式。
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寻找外星生命：德雷克公式 The Search for Life The Drake Equation
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寻找外星生命：德雷克公式 The Search for Life The Drake Equation
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寻找外星生命：德雷克公式 The Search for Life The Drake Equation
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