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The first three parameters in the Drake equation have values that have been estimated from
astronomical observations to be N. =4.001011,Np=3, and fh=0.300 What if we assume that 2.0010
1% of planets in a habitable zone evolve life (f=2.00102), that when life evolves, 2.81101% of the
Estimate the number of civilizations in the galaxy to one significant figure (e.g. if you compute 8.23
109, just answer "8 8109nn),

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