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FILE - In this Aug. 4, 1977 photo provided by NASA, the "Sounds of Earth" record is mounted on the Voyager 2 spacecraft in the Safe-1 Building at the Kennedy Space Center, Fla., prior to encapsulation in the protective shroud. Sunday, Aug. 20, 2017 marks the 40th anniversary of NASA's launch of Voyager 2, now almost 11 billion miles distant. (AP Photo/NASA)

FILE - In this Aug. 4, 1977 photo provided by NASA, the "Sounds of Earth" record is mounted on the Voyager 2 spacecraft in the Safe-1 Building at the Kennedy Space Center, Fla., prior to encapsulation in the protective shroud. Sunday, Aug. 20, 2017 marks the 40th anniversary of NASA's launch of Voyager 2, now almost 11 billion miles distant. (AP Photo/NASA)

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