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Earth Song

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A new NASA ScienceCast video explores the eerie-sounding radio emissions that come from our own planet.

"It's called chorus," explains Craig Kletzing of the University of Iowa. "This is one of the clearest examples we've ever heard." Play the audio

Chorus is an electromagnetic phenomenon caused by plasma waves in Earth's radiation belts. For years, ham radio operators on Earth have been listening to them from afar. Now, NASA's twin Radiation Belt Storm Probes are traveling through the region of space where chorus actually comes from--and the recordings are out of this world.

Retrieved by DonEMitchell 05:54, 2 October 2012 (MDT). More at

Listen to a NASA recording fron inside the Van Allen Radiation Belt of Earth Song: