More than a century ago, physicist Albert Einstein predicted the existence of black holes—points in space where gravity is so powerful nothing, not even light, can escape their pull. Since then, black holes have become fixtures in science fiction. They're potent symbols of mystery in part because we know so little about them. But a lot has changed in the past decade. We now understand more about these cosmic phenomena than ever before, including what they sound like. We speak to the scientist who led the project to capture the sound and two astrophysicists to better understand black holes—points where the laws of physics don't apply. Want to support 1A? Give to your local public radio station and subscribe to this podcast. Have questions? Find us on Twitter @1A.