The search for extraterrestrial intelligence (SETI) is a collective term for scientific searches for intelligent extraterrestrial life, for example, monitoring electromagnetic radiation for signs of transmissions from civilizations on other planets.
https://en.wikipedia.org/wiki/Search_for_extraterrestrial_intelligence
地球外知的生命体探査(ちきゅうがいちてきせいめいたいたんさ、英語: Search for Extra Terrestrial Intelligence)とは、地球外知的生命体による宇宙文明を発見するプロジェクトの総称
https://ja.wikipedia.org/wiki/%E5%9C%B0%E7%90%83%E5%A4%96%E7%9F%A5%E7%9A%84%E7%94%9F%E5%91%BD%E4%BD%93%E6%8E%A2%E6%9F%BB
https://www.seti.org/