actually you are right, sounds needs a meduim to propagate,
yet what i was reffering as "sounds" is the whole radio frequency spectrum, which does propagates in absolute vacum (the simplest ex being lightwaves)
we just started off the wrong def, but that is all cleared out ! thanks for reminding me

The key to explaining something complew is to simplify the problem to the point any explantations will do, but then what have you achieved .... ?