Wednesday, December 8, 2010

Drake Equation

The question of the number of communicating civilizations in our galaxycould, in Drake's view, be reduced to seven smaller issues:
The rate of star formation in our galaxy at the time our Solar System was formed (R*);
The fraction of stars that have planets around them (fp);
The number of planets per star that are capable of sustaining life (ne);
The fraction of planets in ne where life evolves (fl);
The fraction of fl where intelligent life evolves (fi);
The fraction of fi that communicate (fc);
The lifetime of a communicating civilization (L);
Denoting the number of communicating civilization in our galaxy by N, and multiplying the different elements, we get the famous Drake Equation:
N= R* fp ne fl fi fc L  

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