Briefly summarize current knowledge about the term Np in the equation
Number of Civilizations = Np × $ f_{\mathrm{}} $life × $ f_{\mathrm{}} $civilization × $ f_{\mathrm{}} $ now.

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The Answer of Briefly summarize current knowledge about the term Np in the equation
Number of Civilizations = Np × $ f_{\mathrm{}} $life × $ f_{\mathrm{}} $civilization × $ f_{\mathrm{}} $ now.

Briefly Summarize Current Knowledge About the Term Np in the Equation