Chirps of alien birds?
Two NASA spacecraft captured the clearest sound recordings yet from Earth's radiation belts and they're described by a scientist as the chirping of "alien birds". The Van Allen Probes are studying the radiation belts and collecting detailed measurements of high-energy particles and radio waves. These so-called chorus waves operate in the same frequency as human hearing. The high-pitched radio waves were played at a conference in San Francisco on Tuesday.
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