
The desire to contact intelligent life on other planets is much older than the UFO craze and the SETI movement. Several 19th century scientists contemplated how we might communicate with possible Martians and Venusians.These early proposals- which predate by 150 years the first extraterrestrial message that was sent in 1974 - were based on visual signals, as the invention of radio was still decades away.
In fact, as history shows, ideas for interplanetary communication have largely been driven by whatever the current technology allowed - be itlamps, radios or lasers.
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