but you know only half of us are actually using physics. the other half are thinking from thier point of view.
you know asteriods in space dont make any noises at all. neither does the cool fighters in starwars. there is no atmosphere for sound to travel. but what holds true is that sound frequencies are released(energy cannot be destroyed, for whatever hes called law of whatever). but you imagine them thier anyway. some startrek fans remmeber the noise darthvadars worldship made when it exploded right?
hope you got the first part. anyway, these frequencies will soon later be picked up by deepspace radar. even though it may be destorted it can be pin-pointed from one location.(gee, i wonder how radar and sonar works?)