A solar-powered balloon takes flight bearing multiple scientific instruments, including a GPS tracker and a reusable 'infrasound' sensor.(Courtesy Sandia National Laboratories)At first listen, Earth's stratosphere seems calm and quiet.But when researchers launched solar-powered balloons up 70,000 feet, they detected a hidden acoustic world - including mysterious noises without a known origin.
#back #years #researchers #temperature #experiments #instruments #earthquakes #federal-aviation-administration #wind-turbines
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