Add Yahoo as a preferred source to see more of our stories on Google. Solar-powered balloons are recording mysterious sounds below human hearing in the stratosphere. The unknown crackling could be the ...
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 ...
Up, up in the air ... scientific solar-powered balloons have recorded some strange sounds in the stratosphere researchers cannot identify. Daniel Bowman and other researchers at Sandia National ...
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