From the SETI Institute ... THE DRAKE EQUATION How can we estimate the number of technological civilizations that might exist among the stars? While working as a radio astronomer at the National Radio Astronomy Observatory in Green Bank, West Virginia, Dr. Frank Drake (now President of the SETI Institute) conceived an approach to bound the terms involved in estimating the number of technological civilizations that may exist in our galaxy. The Drake Equation, as it has come to be known, was first presented by Drake in 1961 and identifies specific factors thought to play a role in the development of such civilizations. Although there is no unique solution to this equation, it is a generally accepted tool used by the scientific community to examine these factors. The equation is usually written: N = R* x fp x ne x fl x fi x fc x L Where, N = The number of civilizations in The Milky Way Galaxy whose radio emissions are detectable R * = The rate of formation of stars suitable for the development of intelligent life f p = The fraction of those stars with planetary systems n e = The number of planets, per solar system, with an environment suitable for life f l = The fraction of suitable planets on which life actually appears f i = The fraction of life bearing planets on which intelligent life emerges f c = The fraction of civilizations that develop a technology that releases detectable signs of their existence into space L = The length of time such civilizations release detectable signals into space Within the limits of our existing technology, any practical search for distant intelligent life must necessarily be a search for some manifestation of a distant technology. A search for extraterrestrial radio signals has long been considered the most promising approach by the majority of the scientific community. Besides illuminating the factors involved in such a search, the Drake Equation is a simple, effective tool for stimulating intellectual curiosity about the universe around us, for helping us to understand that life as we know it is the end product of a natural, cosmic evolution, and for making us realize how much we are a part of that universe. A key goal of the SETI Institute is to further high quality research that will yield additional information related to any of the factors of this fascinating equation. - end -