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'''ドレイクの方程式'''(ドレイクのほうていしき、{{lang-en|Drake equation}})とは、我々の[[銀河系]]に存在し人類とコンタクトする可能性のある地球外[[文明]]の数を推定する[[方程式]]である。この方程式は、[[1961年]]に[[アメリカ合衆国|アメリカ]]の[[天文学者]]である[[フランク・ドレイク]]によって考案された<ref name="Drake1">Drake, F.D., ''Discussion of Space Science Board, National Academy of Scientific Conference on Extraterrestorial Intelligent Life'', November 1961, Green Bank, West Virginia.</ref><ref name="Wallenhorst">Wallenhorst, S. G. "The Drake Equation Reexamined," ''ROYAL ASTRON. SOC. QUARTERLY JOURNAL'' vol.22, P. 380, 1981. [http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1981QJRAS..22..380W&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf PDF]</ref><ref name="Cirkovic"> Milan M. Cirkovic, "The Temporal Aspect of the Drake Equation and SETI," ''Astrobiology,'' vol.4, pp.225-231, 2004. {{arxiv|archive=astro-ph|id=0306186}}</ref>ことから、その名を取って名付けられた。
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