If you like thinking about Planet and Space Sounds, here is some info. on NASA's Audio Development Laboratory
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How we communicate in space
ENJOY THE SKIE FOR MILES AND MILES. WE ARE ONE FAMILY ON THIS EARTH. ALAN SHEPARD PROJECT
Song of Earth
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Voyager Audio Files- Space Sounds NASA
What Are Planet Sounds?
Technically, Sound is defined as a hearable noise. In Space sound is in the form of electromagnetic vibrations that pulsate in wavelengths. Click this for more on NASA's Advancements in detecting space sounds:
Most cosmic objects emit frequencies that are higher than our ears can hear. Click this to learn about how radio waves help us in Astronomy: Planets emit radiation which can be used to make sounds that we hear. The Voyager 2 Planet Sound Recordings are electromagnetic frequency and particle osscilation frequencies that NASA converted into sound waves that we can listen to and enjoy.
Here is an article on: Sources of Radio Waves in the Universe: