In 2004, the Cassini spacecraft arrived at Saturn after seven years of touring the solar system. Among other data, it recorded the radio waves emitted by Saturn’s famous rings. Later, those recordings were reduced by a factor of five to bring them into the range of human hearing. This recording is the result. Scientists posit this is the sound of meteoroids hitting chunks of ice that make up the rings, like mallets on a marimba, or (more apropos) a needle on the grooves of a record.