When they were launched in 1977, the two Voyager spacecraft each carried with them a 12-inch gold-plated copper record containing multimedia pertaining to life on Earth, the idea being that if an extraterrestrial ran across one of these records millions of years from now, they could play it an learn something about our planet. A site (click the pic) site has a listing of some of the music, images, and sounds contained on the records. The above picture is a family portrait illustrating humanity’s basic social structure.
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