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Communication with extraterrestrial intelligence (CETI) refers to the theoretical and practical efforts aimed at establishing contact with intelligent life beyond Earth. This field encompasses a variety of disciplines, including astrobiology, astronomy, and communication theory. Here are some key aspects of CETI: 1. **Search for Extraterrestrial Intelligence (SETI):** SETI is one of the most well-known initiatives related to CETI. It involves scanning the cosmos for signals that may indicate the presence of alien civilizations.