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Search for Extraterrestrial Intelligence (SETI) as a book category encompasses works focused on the scientific, technical, historical and cultural effort to detect intelligent life beyond Earth. It includes popular science and technical treatments of radio and optical searches, signal processing, astrobiology, and survey methods; histories and memoirs of SETI projects and institutions; discussions of the Drake equation, Fermi paradox, and communication protocols; and explorations of the ethical, philosophical and societal implications of contact. The category also embraces speculative fiction and thought experiments that dramatize contact scenarios, making it a blend of rigorous science, policy debate and imaginative inquiry.

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