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Astronomer Frank Drake with his famous equation, which estimates the number of potentially detectable alien societies in the Milky Way galaxy.
Astronomer Frank Drake, who pioneered the modern search for intelligent life in the universe, passed away Friday (Sept. 2) at the age of 92.
Drake is best known for the equation that bears his name, a formula that estimates how many detectable alien societies may exist in our Milky Way galaxy. Drake devised his famous equation in 1961, a year after he initiated Project Ozma, which used a radio telescope to hunt for possible signals from extraterrestrial civilizations.