Solar-Powered Balloons Detect Mysterious Sounds In The Stratosphere
pick up a variety of sounds unheard anywhere else. This includes natural sounds from colliding ocean waves and thunder, human-created sounds like wind turbines or explosions, and even sounds with unknown origins.
“Our balloons are basically giant plastic bags with some charcoal dust on the inside to make them dark. We build them using painter’s plastic from the hardware store, shipping tape, and charcoal powder from pyrotechnic supply stores. When the sun shines on the dark balloons, the air inside heats up and becomes buoyant. This passive solar power is enough to bring the balloons from the surface to over 20 km in the sky,” said Bowman.
Along with the expected human and environmental sounds, Bowman and his team detected something they are not able to identify.
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