American balloons stumbled upon unfamiliar sounds at low frequencies that were detected in the stratosphere.
The advantage of being in the stratosphere is that it is quieter there than on other surfaces. Special equipment is able to hear what is not subject to the human ear.
Inexplicable sounds were indeed heard, moreover, by several balloons at once, which at that time reached a height of 21 kilometers.
Of course, part of the sounds can come from terrestrial objects, it can even be vibrations of sea waves. However, scientists still remained in doubt about the origin of the captured sounds.
To date, experts continue to study to determine the nature of other sounds that were repeated over and over again within one hour. Writes about it reedus .
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