What is the Drake Equation?
By Cody Andrus The Drake Equation is a way to organize a question rather than answer it. It was proposed in 1961 by Frank Drake to structure discussion about how many technologically capable civilizations might exist in the Milky Way. The equation does not produce a definitive number. Instead, it identifies the factors that would have to be understood before any estimate could be made responsibly. The equation divides the problem into a series of terms. It begins with the rate at which stars form in the galaxy and asks how many of those stars have planetary systems. It then considers how many planets might be capable of supporting life. From there, the focus shifts away from astronomy and toward biology and behavior, asking how often life emerges, how often intelligence develops, and how often that intelligence produces technology detectable from a distance. Each term reflects a different kind of uncertainty. Some of the astronomical factors are now better constrained than they were w...