By Anupum Pant
Some graduate students, running a NASA experiment captured a series of strange sounds about 36 km above the earth’s surface. They had sent a balloon equipped with a recorder that could record sounds much below our hearing range (in frequency).
The origin of these sounds isn’t known yet. They say it might be coming from crashing ocean waves, wind turbulence, gravity waves, clear air turbulence, and vibrations caused by the balloon cable.
Now since you can’t hear it, you have to speed it up so you can hear it. Here’s the recording sped up about 1000 times.