By: Ashley Strickland
Giant solar balloons were sent 70,000 feet up in the air to record sounds of Earth's stratosphere. The microphones picked up aircraft, thunder, explosions, colliding ocean waves, as well as some unidentified sounds.
Producer for CNN Health & Wellness. Writer, photographer, space and science nerd, fitness enthusiast, music lover. (All views personal, rt ≠ endorsement)
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