about space ?

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I was wondering. Although its obvious and practically everyone knows it, but how is there no sound in space when, although there exists no medium capable which allows sound waves to propagate, there are 'virtual particles'.. shouldn't they allow the propagation of sound wave as they are particles after all ?

 

Or is it that they are incapable of supporting sound wave because they only exist for brief periods of time, therefor not long enough for the sustenance and/or maintenance of the waves...