Although space is a vacuum, sound does exist in it. Not as pulsing waves through the air how we perceive it, but as electromagnetic vibrations -electromagnetic waves that pulsate at the same wavelength as the sound waves… so we can actually hear the sounds in(of)space.
The specially designed instruments on several NASA probes, including Voyager, have picked up and recorded these waves and translated this complex interactions of charged electromagnetic particles from the Solar Wind ionosphere and planetary magnetosphere into sounds that are all within the range of human hearing (20-20,000 Hz).