How Radio Enthusiasts Are Listening to Earth’s Secret Symphony

Stephen McGreevy looked nervously at the sky. Outside his camper van in Nevada’s Black Rock Desert, angry black clouds gathered on the horizon as 30-mile-per-hour winds whipped across the flat expanse. At his feet, an array of copper wire—hundreds of feet of it—writhed like snakes. As rain beat against the roof, McGreevy hastily gathered the cable, shoved it in the van among a tangle of recording equipment, and hit the road. He was headed for Oregon, where he planned to have the array set up again before dawn in hopes of capturing strange sounds from the sky.

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