Earth, the solar system, and the stars are full of eerie “sounds” – if we listen in on waves in light and radio, converting those signals to sound. In addition to the EMF sounds, there are also some really beautiful sounds that happen in a lab on Earth – like this recording of ultra-cold liquid helium: The materials actually largely mislabeled as Creative Commons ShareAlike – Noncommercial – most of these NASA assets are in fact public domain, and you can’t add a more restrictive license once a less restrictive one is out there.