The Drake Equation is used to attempt to calculate the number of detectable civilisations in the galaxy - N
This is the equation: N = Rs x Fp x Ne x Fl x Fi x Fc x L
Only the first two figures in the equation are known -
Rs = the rate of star formation
Fp = the fraction of stars with planetary systems
The rest are unknown, so this is hardly an exact science - merely a best guess.
Further details on how to make an estimate can be found on the BBC's Horizon pages.
www.bbc.co.uk/horizon
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