# Frank Drake The American astronomer who **founded the modern search for extraterrestrial intelligence (SETI)** and **articulated the Drake Equation** — the framework for decomposing the question of how many communicating civilizations might exist in our galaxy. Drake (1930–2022) conducted the first systematic SETI search (Project Ozma, 1960) and organized the 1961 Green Bank conference where he wrote his namesake equation on a chalkboard. The equation, originally a meeting agenda, became one of the foundational frameworks of astrobiology. ## Career and contribution **Background.** Cornell University (BA 1952), Harvard (PhD 1958). Long career at the National Radio Astronomy Observatory and subsequently UC Santa Cruz. Founded the SETI Institute (1984). **Project Ozma (1960).** The first systematic radio-astronomy search for extraterrestrial signals. Drake used a radio telescope at Green Bank, West Virginia, to listen to two nearby sun-like stars (Tau Ceti and Epsilon Eridani) at frequencies near the 21-cm hydrogen line — a frequency that Drake reasoned would be a natural communications choice. No signals were detected; the systematic methodology was the lasting contribution. **The Drake Equation (1961).** Originally written as an agenda for the November 1961 Green Bank conference. The equation decomposes the number of communicating civilizations (N) into seven multiplicative factors: rate of star formation; fraction with planets; planets per star with conditions for life; fraction where life develops; fraction where intelligence evolves; fraction where intelligent life develops technology; average lifetime of technological civilization phase. The factors range from well-constrained (early factors, where exoplanet data has revolutionized estimates since 2000) to highly speculative (late factors involving intelligent civilizations' development and longevity). **Subsequent SETI work.** Drake continued SETI research throughout his career, including involvement in the Arecibo message (1974, a one-time radio transmission aimed at the M13 globular cluster), the Voyager Golden Record (1977, encoded greetings included on the Voyager spacecraft), and various SETI-Institute efforts. ## KB significance **Decomposing hard estimation problems.** The Drake Equation's methodology — multiplicative decomposition of an uncertain quantity into more-knowable factors — is the lasting analytical contribution. The specific astrobiological output is uncertain by orders of magnitude (estimates range from "we're alone in the galaxy" to "the galaxy is teeming"); the framework's value is in the structure that makes the uncertainty legible. The methodology transfers to many other estimation problems including political and policy ones. ## See also - Drake Equation — the eponymous framework - Goldilocks Zone — closely related astrobiological concept