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Last Updated: Jan 8th, 2011 - 16:45:13

 Mathematics

The Drake Equation Calculator
By ClassBrain staff
Aug 24, 2006, 21:04 PST

 R - Rate of formation of suitable stars in our galaxy (aggregate number) R = 1 billion 10 billion 100 billion 200billion 300 billion 400 billion 500 billion 600 billion fp - Percentage of those stars with planets fp = .0001% (1 of 1,000,000) .001% (1 of 100,000) .01% (1 of 10,000) .05% (1 of 2,000) .1% (1 of 1,000) .5% 1% 2% 5% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Ne -Number of planets per star that could sustain life like earth Ne = .33 .5 .67 1 1.5 2 3 4 5 fl - Percentage of those planets where life actually develops fl = .0001% (1 of 1,000,000) .001% (1 of 100,000) .01% (1 of 10,000) .05% (1 of 2,000) .1% (1 of 1,000) .5% 1% 2% 5% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% fi - Percentage of planets from fl with intelligent life fi = .0001% (1 of 1,000,000) .001% (1 of 100,000) .01% (1 of 10,000) .05% (1 of 2,000) .1% (1 of 1,000) .5% 1% 2% 5% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% fc - Percentage of planets from fi where technology develops fc = .0001% (1 of 1,000,000) .001% (1 of 100,000) .01% (1 of 10,000) .05% (1 of 2,000) .1% (1 of 1,000) .5% 1% 2% 5% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% L - "Lifetime" of communicating civilizations (years) L = 1 / 1,000,000,000th (10 years) 1 / 100,000,000th (100 years) 1 / 10,000,000th (1,000 years) 1 / 1,000,000th (10,000 years) 1 / 100,000th (100,000 years) 1 / 10,000th (1,000,000 years) 1 / 1,000th (10,000,000 years) 1% (100 million years) 10% (1 billion years) 20% (2 billion years) 30% (3 billion years) 40% (4 billion years) 50% (5 billion years) 100% R * fp * Ne * fl * fi * fc * L = N N - Number of communicative civilizations N =