Attempts to Contact Aliens Date Back More Than 150 Years

Attempts to Contact Aliens Date Back More Than 150 Years
With its 1,000-foot reflector dish, the Arecibo Observatory in Puerto Rico is the world's largest single-dish radio telescope and most powerful radar. Frank Drake used it in 1974 to send the first CETI message.
(Image: © NAIC/Arecibo Observatory/NSF)

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