On June 7, NASA’s Juno spacecraft passed within 650 miles of the surface of Ganymede, the largest moon of Jupiter. NASA’s Jet Propulsion Laboratory released the 50-second audio track recorded during the fly-by, and it’s a strange series of beeps and boops.
It’s not quite an actual audio recording, though. The audio was generated from the data collected while the probe passed through Ganymede’s magnetic field; it’s the largest moon in the solar system and the only moon with its own magnetic field.
Source: Daily Mail