Drake equation

(redirected from Green Bank equation)

Drake equation

[′drāk i‚kwā·zhən]
(astronomy)
An equation which gives the number of advanced technological civilizations curently active in the Galaxy as the product of the rate at which new stars are born in the Galaxy, the probability (actually a product of probabilities) that any one of these stars will possess the necessary conditions for life to originate and to slowly evolve to a technological civilization, and the average longevity of such civilizations.
References in periodicals archive ?
The socalled Green Bank equation of Frank Drake and Carl Sagan attempted to predict the likelihood of detecting such life beyond the Earth by multiplying variables to calculate the chance that a star has planets orbiting it, that life has arisen on such planets, and that such life is intelligent and technologically proficient enough to communicate by sending electromagnetic messages through the interstellar medium.