Summary
Explosions in space movies are loud, but in reality sound cannot propagate in vacuum. Sound needs a medium to carry vibrations, and space lacks it.
Those huge explosion sounds in space scenes are a film language choice. Real physics is strict: sound needs a carrier.
Sound is a pressure wave in air or water, moving because particles push and pull on each other. In vacuum, there are too few particles to pass the wave along.
Space is not absolute nothing; thin gas and plasma regions exist. But the density is so low that you do not get a normal sound experience.
This also explains why films do it differently: drama. In science, silence is one of space most realistic signatures.
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