Talking to extraterrestrials SETI and CETI: Scientists search for signals from intelligent extraterrestrial civilizations using radio and optical telescopes within the discipline of extraterrestrial intelligence communications (CETI). CETI focuses on composing and deciphering messages that could theoretically be understood by another technological civilization. Communication attempts by humans have included broadcasting mathematical languages, pictorial systems such as the Arecibo message, and computational approaches to detecting and deciphering 'natural' language communication. While some high-profile scientists, such as Carl Sagan, have advocated the transmission of messages,Sagan, Carl. Communication with Extraterrestrial Intelligence. MIT Press, 1973, 428 pp. theoretical physicist Stephen Hawking warned against it, suggesting that aliens may raid Earth for its resources.
Talking to extraterrestrials SETI and CETI: Scientists search for signals from intelligent extraterrestrial civi?lizations using radio and optical telescopes within the discipline of extraterrestrial intelligence communications (CETI). CETI focuses on composing and deciphering messages that could theoretically be understood by another technological civilization. Communication attempts by humans have included broadcasting mathematical languages, pictorial systems such as the Arecibo message, and computational approaches to detecting and deciphering 'natural' language communication. While some high-profile scientists, such as Carl Sagan, have advocated the transmission of messages,Sagan, Carl. Communication with Extraterrestrial Intelligence. MIT Press, 1973, 428 pp. theoretical physicist Stephen Hawking warned against it, suggesting that a!liens may raid Earth for its resources.