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Extraterrestrial intelligence (ETI) refers to intelligent life forms that originate from outside Earth. This concept encompasses the possibility of intelligent beings living on other planets or celestial bodies in the universe. The search for extraterrestrial intelligence includes the study of potential signals or communications from such beings, as well as the exploration of planets and moons within our solar system and beyond that might harbor life. The field of astrobiology focuses on the conditions necessary for life and the potential for its existence elsewhere in the universe.