Would astronomy be different if sound could propagate through space?

Sound does propagate through space, but it does so within gas which tends to be fairly dissipative. This means, just like sounds on Earth, they quickly die out over any substantial distance. So we can’t really use sound waves to explore the Universe.
Nonetheless, sound waves have some interesting consequences. For instance, sound waves are a leading candidate for the mechanism by which black hole jets transfer energy to intracluster gas, thereby preventing cooling and making galaxies into red and dead ellipticals. Indeed, such sound waves have been observed, as shown in the image below of the Perseus cluster, where the underlying smooth component has been removed to show the inhomogeneities.

         





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