When Was the First Interstellar Radio Message Sent?
The Arecibo Message, humankind’s first interstellar radio message, sent from the Arecibo Observatory in Puerto Rico in 1974, is a three-minute message of exactly…
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The Arecibo Message, humankind’s first interstellar radio message, sent from the Arecibo Observatory in Puerto Rico in 1974, is a three-minute message of exactly…