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Hi 3point14rat, why do you say the bubble is moving at the speed of sound, electromagnetic waves travel at the speed of light.  FYI:  The very first experiments where electromagnetic waves were produced was done by David Edward Hughes in 1880, 139 years ago so the bubble would be 139 light years out.  There are approximately 5900 stars 150 light years from our sun.   But signal strength would be so weak by then and background noise from our sun would be so great that it would take a very huge antenna to detect the earth bubble. The calculations used to determine if you are able to receive a signal are called a “link budget”. If you plug in the numbers, you’ll find that to receive commercial transmissions from the earth at the distance of the nearest stars, you would need huge antennas, maybe something the size of the solar system.  Not to mention that the earth, at that distance, would be seen as very close to the sun, so any transmission from the earth would be swamped by the much stronger radio emissions from the sun.