Drake Equation ·
How Many Civilizations?
un
seel
.com · Green Bank · 1961 · N = R* × f
p
× n
e
× f
l
× f
i
× f
c
× L
Factors
7
Measured
0 / 3
Stage
opening
Astrophysics (measured)
Active factor
Biology / sociology (unknown)
Communicating civilization
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.com · Drake Equation