A Brief-ish History of METI. Part II: From Interplanetary to Interstellar
Illustrative image The latter half of the 20th century saw a major expansion of the Search for Extraterrestrial Intelligence (SETI), accompanied by corresponding advances in Messaging Extraterrestrial Intelligence (METI). A key development was the first interstellar SETI and METI experiments: Project Ozma and the Arecibo Message.
Source：Universe Today
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