Earth is Singing Like a Whale, Says NASA
The whale sound emitted by Earth is an audio rendering of radio waves, caused by two Van Allen belts, captured by NASA’s Probes. The Van Allen radiation belt is composed of two torus-shaped layers of energetic charged particles (plasma) around the planet Earth, held in place by its magnetic field. The sound waves were recorded by two satellites investigating these two famous belts, according to NASA.
The recording captured is in 16-bit audio format, which you would get from a audio disc, although this radio interference had always been there and never left unnoticed, this is the first time it has been recorded this clearly.