This gold aluminum cover was designed to protect the Voyager 1 and 2 "Sounds of Earth" gold-plated records from micrometeorite bombardment, but also serves a double purpose in providing the finder a key to playing the record. The explanatory diagram appears on both the inner and outer surfaces of the cover, as the outer diagram will be eroded in time.Flying aboard Voyagers 1 and 2 are identical records, carrying the story of Earth far into deep space. The 12-inch gold-plated copper discs contain greetings in 60 languages, samples of music from different cultures and eras and natural and man-made sounds from Earth. They also contain electronic information that an advanced technological civilization could convert into diagrams and images.
http://www.nasa.gov/multimedia/imagegallery/image_feature_631.html
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