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Published online by Cambridge University Press: 19 September 2017
The Search for Extraterrestrial Intelligence (SETI) has been, in its modern sense, a search for signs of technology beyond the Solar System. Such a search is a natural companion to visual and radio astronomy, which searches the electromagnetic spectrum to glean information about natural cosmic events. To succeed, SETI must demonstrate the existence of signals that cannot be explained by natural events and that are not of terrestrial origin.