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The sound is awful, a new recording from space reveals...
Earth emits an ear-piercing series of chirps and whistles that could be heard by any aliens who might be listening, if they're out there.
Scientists have known about the radiation since the 1970s. It is created high above the planet, where charged particles from the solar wind collide with Earth's magnetic field.
It is related to the phenomenon that generates the colorful aurora, or Northern Lights.