https://www.livescience.com/space/astronomy/mysterious-ultra-low-frequency-noises-detected-in-earths-atmosphere-and-scientists-cant-explain-them
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5/13/23 at 12:00pm
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Live Science
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Ben Turner
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Solar-powered balloons detected strange rumblings at a height of 70,000 feet above the Earth's surface. Scientists can't identify them.
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