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 the ability to talk across long distances, human beings can harness the power of electromagnetism and radiation (radio waves). Radio waves can be sent up to 12,000,000,000 (12 billion) miles which is where the end of the solar system reaches. It's possible radio waves can travel further but the theory ha...
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