Earth emits an ear-piercing series of chirps and whistles that could be heard by any aliens who might be listening, astronomers have discovered.
The sound is awful, a new recording from space reveals.
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 colorful aurora, or Northern Lights.. It is related to the phenomenon that generates the
The radio waves are blocked by the ionosphere, a charged layer atop our atmosphere, so they do not reach Earth. That’s good, because the out-of-this-world radio waves are 10,000 times stronger than even the strongest military signal, the researchers said, and they would overwhelm all radio stations on the planet.
Theorists had long figured the radio waves, which were not well studied, oozed into space in an ever-widening cone, like light from a torch.
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