Humans produce sound by vibrating molecules in the air in front of them. These molecules travel in a wave form. The human voice can only travel 600' before it runs out energy. In order to extend our ability to talk across long distances we can harness the power of electromagnetism and radiation (radio waves). Radio waves can be sent up to 12 billion miles which is where the end of our solar system reaches. It's possible they can travel further but the theory has yet to be tested physically...
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