I Have Random Thoughts

These are electromagnetic pulses (EMP) generated in nature around us. They are silent as far as the human ear is concerned, but can be picked up by certain instruments (strength, shape, etc.).

Special circuitry duplicates the EMP and a circuit feeds it to a speaker. This is a simplification of the process, but captures the highlights (speakers work by having an EMP act on a permanent magnet to vibrate the speaker and produce sound).

Planets, galaxies, stars, moons, and a whole lot more out there produce EMP, filling the "void" of space.

It's thought our entire universe vibrates at a certain frequency too :)

Edit - Actually I might have seen that on Star Trek so don't take it as fact, lol :D

thanks ! that is interesting indeed :)