Planetary Radio Special Edition: The Voyager Golden Record by Twenty Thousand Hertz
Planetary Radio: Space Exploration, Astronomy and Science
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The Humpback Whale Song
Human greetings are mixed with another sound than humpback whale songs. Karl sagan believed that they carried a lot of information, just like human speech. If this record is found by inter galactic life, it's possible they could understand a whale song just as well as they could understand human speech.
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