A Brief-ish History of SETI. Part IV: Arecibo and the WOW! Signal

Artist's impression of the Arecibo Message (left), aerial view of the Arecibo Radio Telescope (right). Credit: Arne Nordmann/Wikimedia/NIAC

During the 1970s, pioneering experiments were conducted that are known today as Messaging Extraterrestrial Intelligence (METI). At the same time, NASA launched four spacecraft bound for interstellar space, each carrying "messages in a bottle" intended for extraterrestrial beings.

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