NASA's Voyager 1 Spacecraft Captures Sounds of Interstellar Space

The plasma wave instrument on NASA's Voyager 1 spacecraft captured these sounds of dense plasma, or ionized gas, vibrating in interstellar space. These vibrations were detected twice - from October to November 2012, and from April to May 2013. The graphic shows the frequency of the waves, which indicate the density of the plasma. Colors indicate the intensity of the waves, or how 'loud' they are. Red indicates the loudest waves and blue indicates the weakest. The soundtrack reproduces the amplitude and frequency of the plasma waves as 'heard' by Voyager 1. The waves detected by the instrument antennas can be simply amplified and played through a speaker. These frequencies are within the range heard by human ears.