Doing the math on the Port Weathervanes shirt square law and distance to nearest stars you will (hopefully) notice that even such “large” output signals coming from a nearby star would be essentially undetectable by the time they got here. At only 4LY (roughly 3.784×10^16 meters) to the nearest star the signal would be attenuated by a factor of 1.4×10^-33. So the original kilowatt becomes less than a thousandth of a billionth of a billionth of a billionth of a watt give or take a few decimal places. Spell that out in your best Carl Sagan voice to get the full effect of how small it really is. If you had a gigantic antenna (or array of antennas) and you were looking in exactly the right place in the sky you *might* be able to pick that will o’ the wisp signal out of the background radiation, but probably not. Now you might argue that our noisy neighbors would be shouting louder with much more powerful transmitters, but why would they? Their TV and commercial traffic would only need to be as loud as ours to reach their own people. And even if they were broadcasting many orders of magnitude “louder” at the origin it wouldn’t make much difference.
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I am really not sure would this be possible to create such sounds which is 1100 dB in earth. As far as i understood about this concept is, This measurements of Port Weathervanes shirt the dB SPL is refers only to our human hearing systems. Since the reference value used for this calculation is 20 μpa. which might be the sensitivity pressure can be recognized by our eardrum. According to our measurements, yes! 194 dB would be the maximum can be created through the atmospheric pressure of the air. But if by any chance you hear this sound that would be the last sound you gonna hear in your life!!!. 1100 db is possible only when this happens, pressure variation from the reference to the value of 1.56*10^(47)Pa. But i would say this is may be possible in atmosphere filled with different fluids, Which may yet to be found!!.. Also if you think in our earth, atmospheric pressure is 101.325 kPa. I feel in space there can lot of local atmospheres formed with heavily dense fluids and that may create the value of Port Weathervanes shirt.