: Astronomy: search for extraterrestrial intelligence

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search for extraterrestrial intelligence

SETI is the Search for Extraterrestrial Intelligence. The first practical proposals in SETI were made in the nineteenth and early twentieth centuries, but were aimed only at interplanetary communication. The roots of SETI in its modern form, as a search for artificial signals over interstellar and even intergalactic distances, can be traced back to the 1930s with the discovery by Karl Jansky of radio waves coming from a source outside the Solar System. This led, in time, to the birth of radio astronomy and to the construction, in the late 1950s, of the first large radio telescopes such as those at Jodrell Bank and Green Bank. Only with such powerful instruments was it feasible to start looking for Earth-type signals from nearby stars. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/S/SETI.html)

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