Surrounding our planet are rings of plasma, part of Earth's magnetosphere, which are pulsing with radio waves. Those waves are not audible to the human ear alone, but radio antennae can pick them up, and that's just what an instrument -- the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) -- on NASA's recently launched Radiation Belt Storm Probes has done.
The noises, often picked up here on Earth by ham-radio operators, are called Earth's "chorus" as they are reminiscent of a chorus of birds chirping in the early morning. So here's your planet, singing its song into space.
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