Although space is a virtual vacuum, this does not mean there is no sound in space. Sound does exist as electromagnetic vibrations. The specially designed instruments on board the various space probes used Plasma Wave antenna to record the vibrations used here, all within the range of human hearing (20-20,000 CPS)
Listening to this recording, I am reminded that Neptune has wind speeds up to 1,370 mph/ 2,200 km, the fastest winds in our solar system.
Happy Neptuner direct