Even if the Drake Equation is true, and there are millions of civilizations out there, finding them is like looking for a needle in a haystack.

即使德瑞克方程序是真的，确实存在着数百万的文明，但要找到他们就像大海捞针。

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His quirky study USES a famous maths formula called the Drake Equation, which was first used to estimate the existence of extra-terrestrial life.

这一公式最初被用于估算外星生命存在的几率。

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L the Drake Equation was proposed by astronomer Frank Drake to work out how mane civilizations there could be in our galaxy - and the figure is millions!

l德雷克方程是天文学家法兰克·德雷克提出的一个计算方法，用来测算银河系中可能存在的文明社会的数量——计算的结果，竟是数以百万计！

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Longevity or "L" is the last term in the Drake Equation, a formula designed to estimate the number of communicative civilizations in our galaxy.

CNN: Should we fear space aliens?

And while out in the San Francisco Bay Area, we swing by the SETI institute to find out how the organization is actively looking for extraterrestrial life in the universe, including a discussion with SETI founder and developer of the Drake Equation, Frank Drake.

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