A solar-powered balloon mission detected a repeating infrasound noise in the stratosphere. Scientists don't know what is making it.
Along with the expected natural and man-made sounds, the microbarometers detected the mysterious repeating infrasound signals.
The sensors were carried aloft by balloons that Bowman and fellow researchers built. Featuring diameters between 20 and 23 feet , the balloons were built from common and inexpensive materials. Powered by sunlight, these deceptively simple devices were able to climb to altitudes of around 70,000 feet over"Our balloons are basically giant plastic bags with some charcoal dust on the inside to make them dark," Bowman said.
Bowman explained that this passive solar power is enough to propel the balloons from the surface of the planet to the stratosphere. After launch, the balloons were tracked using , something that the team had to do because balloons can often fly for hundreds of miles and may land in difficult-to-navigate regions of the planet.
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