Let's put this one to rest once and for all. There is no sound in space. None. Space is a vacuum, and vacuums are devoid of particles. (Unless it's a vacuum cleaner, in which case it's full of all sorts of particles and other dodgy-looking debris.) Sound is a vibration, and no particles means there's nothing to vibrate, hence the lack of noise.
So, all the bips and zaps and yowls and kerpows you hear in space-based movies are totally phony. But moviemakers can rarely resist – or honestly afford to – skip them. Otherwise, fighter ship scenes would seem beyond boring. Even some instrumental music could have a hard time keeping the lame-train from leaving.
Those TIE fighters trying to shoot up the Millennium Falcon in "Star Wars?" Not a peep. At least before the sound engineer got a hold of them.
The not-even-a-little-bit-believable space explosions are a separate issue entirely.