Solar-powered balloons detected strange rumblings at a height of 70,000 feet above the Earth's surface. Scientists can't identify them.
Solar-powered balloons launched into the Earth's stratosphere have recorded a series of mysterious rumblings, and scientists can't pinpoint their origins.
"[In the stratosphere,] there are mysterious infrasound signals that occur a few times per hour on some flights, but the source of these is completely unknown," lead investigator Daniel Bowman , a senior scientist at Sandia National Laboratories in New Mexico, said in a statement .Beginning around 9 miles above the Earth's surface and extending upwards to a height of roughly 31 miles , the stratosphere is the layer of atmosphere above our own.
To sample the stratosphere's soundscape, Bowman and his colleagues built a series of 23-foot-wide plastic balloons, fastening them with infrasound sensors called microbarometers and adding charcoal powder. The darkening property of charcoal allows sunlight to heat air inside the balloon, making the balloons float.
It was during these flights that the researchers picked up the sounds — low, recurring rumbles whose signals could not be traced. The scientists have a few ideas for what these mysterious noises could be, and they range from a previously undetected form of atmospheric turbulence to echoes from below that have become garbled beyond recognition.
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