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  1. Oxford American Dictionary

    Drake equation

    • IPA[ˈdrāk əˌkwāZHən]

    美式

    • n.
      a speculative equation that gives an estimate of the likelihood of discovering intelligent extraterrestrial life in the galaxy, expressed as the product of a series of factors such as the number of stars, the fraction of stars with planets, the fraction of planets on which life evolves, the average lifetime of a civilization, etc. It was formulated by the US astronomer Frank Drake in 1961.

    • noun: Drake equation