N = R * f p n e f l f i f c L
Where,
N = The number of civilizations in The Milky Way Galaxy whose radio emissions are detectable.
R* = The rate of formation of stars suitable for the development of intelligent life.
f p = The fraction of those stars with planetary systems.
n e = The number of planets, per solar system, with an environment suitable for life.
fl = The fraction of suitable planets on which life actually appears.
f i = The fraction of life bearing planets on which intelligent life emerges.
f c = The fraction of civilizations that develop a technology that releases detectable signs of their existence into space.
L = The length of time such civilizations release detectable signals into space.
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