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Here's how high-altitude balloons work | CNN
High-altitude balloon fleet to provide high-res imagery, analyt...
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Hungarian high-altitude balloon conquered the stratosphere − PHOTOS - Daily News Hungary
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:quality(70)/cloudfront-us-east-1.images.arcpublishing.com/archetype/MZLIQB3IANAH7BJRIIS3QOVVHY.jpg "US Army floats the option of fielding high-altitude balloons")