« on: 06/07/2021 02:12:39 »
Maybe that is a related phenomenon but as I recall ,and hopefully understand it was just that galaxies interacted (=ran into) each other and the effect was some extremely ,extremely low frequency waves that might be termed "acoustic" were formed (that propagated through the vacuum)I think Janus once explained to me** that the wave motions of galaxies reverberating through space might be considered a form of extremely ,extremely long wavelength sound transmission.I'm not Janus but might they have been talking about the Baryon Oscillation Spectroscopic Survey?
See "Ancient Sound Waves sculpted galaxy formation." https://www.newscientist.com/article/dn21653-ancient-sound-waves-sculpted-galaxy-formation/
If I find the thread I will update you on what was actually said but I hope others here might know about this effect (if it exists)
Or ,maybe Janus will drop by and explain (if it was indeed he who pointed this out in the past -and if he is not under too much duress in the heatwave on the Pacific North West at present)
EDIT:This is more or less what I had in mind
Still can't find that old thread but that link seems to broadly cover the idea.
Basically no 100% vacuums exist on a large scale and so sound can travel ,albeit at enormous wavelengths.
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