Space signals stump scientists

I find it amazing that we can pick up radio signals from trillions of miles away. What if these signals are machinery plans like those from the movie Contact.
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The fact that sound just keeps on going is astonishing, one would think it would dissipate after a while. I wonder how much time has passed since it was created and sent out. It also makes me think about other sounds and does all sound go on forever or just really big vibrations.