Sound in Space

Isn't the space empty and silent? Well, the space is extremely sparse compared to the Earth, but it does contain a few to hundereds of particles per cube centimeter. The sounds we normally hear are vibrations of molecules in the air. The sounds in space are vibrations of electrons, ions, and electromagnetic fields. And the cool part, a variety of sounds in space fall within human hearing range, from 20 Hz to 20 kHz. So we can hear them when converted to audio.