Earth's Sounds Captured, Sound Like "Chirps" [1]

An artist's rendition of the Van Allen Space Probe provided by NASA and the Goddard Space Center.

CAPE CANAVERAL, Fla. (AP) — Twin spacecraft have captured the clearest sounds yet from Earth's radiation belts — and they mimic the chirping of birds.

ASA's Van Allen Probes have been exploring the hostile radiation belts surrounding Earth for just three months. But already, they've collected measurements of high-energy particles and radio waves in unprecedented detail.