"Contrary to popular belief, sound does exist in space.

To clarify, it’s not sound as we know it (waves pulsing through the air), but electromagnetic waves that pulsate in similar wavelengths as the sound our ears hear."
http://deadstate.org/listen-nasa-probe-records-sounds-from-space-and-its-absolutely-terrifying/

http://youtu.be/-MmWeZHsQzs