The Drake Equation {Calculates the Number of Worlds with Intelligent Life Capable of Technologically Communicating With Us}

It has been postulated by Astronomer and Astrophysicist Dr. Frank Drake, that there are over 10,000 civilizations within the Milky Way Capable of communicating with us.  This  equation, 

                            N= R f n f f f L

Calculates the Number of Civilizations in the Universe 

 R* = Rate of formation of suitable stars

fp = Fraction of those star with planets 

ne = Number of Earth-like worlds per planetary system 

fl = Fraction of planets where life develops

fi = Fraction of life sites where intelligence develops

fc = Fraction of communicative planets

L = The "lifetime" of communication cilizations

                                                                     N = 10,000                                                                                                                                           _________________________

                                                          Communicative Civilizations

                                                               In The Milky Way Galaxy