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Giant solar balloons were sent 70,000 feet up in the air to record sounds of Earth's stratosphere \u2014 and the microphones picked up some unexpected sounds.
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Scientists separated these mysterious noises from other sounds captured from the zone, like the distant sound of ocean waves slamming into each other.
It can reach great heights and bring scientific equipment with it, once discovering sounds in the stratosphere.
Researchers are baffled by strange sounds of unknown origin in the stratosphere.