Like the famous gold record on board the Voyager, the Arecibo message is yet another attempt to contact our cousins Out There. The Arecibo Image is a short binary message the U.S. beamed into outer space. When decoded, it creates an image like something from a 1980's videogame.
Dr. Frank Drake, of Cornell University, wrote the message, with help from Carl Sagan, and others. The encoded message has seven parts.
It will take 25,000 years for the message to reach its target of of stars (and, presumably, an additional 25,000 years for the return trip for any reply). Interestingly, the stars the message is aimed at will no longer be there when it arrives. According to a Cornell News press release of Nov. 12, 1999, the real purpose of the message was not to make contact, but to demonstrate the capabilities of newly installed equipment.
Here is a key explaining the various parts of the image.
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