A copper record containing 'sounds of the Earth'; greetings in 60 languages, songs of birds, whales and animals and samples of music, is being mounted onto the Voyager 2 spacecraft. A similar disc was attached to Voyager 1. Several of the interplanetary probes launched by NASA in the 1970s carried information about the Earth for any alien civilization that might one day intercept the craft. Two Voyager spacecraft were launched in 1977 to explore the planets in the outer solar system and both were succesful, returning many high quality pictures as well as scientific data. Both have now left the Solar System and are heading out into interstellar space.
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