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What a good example of you not having even the remotest clue as to what you are talking about.
Brillouin scattering, refers to the interaction of light and material waves within a medium. Some mediums suggested are, a solid crystal, a macromolecular chain condensate or a viscous liquid or gas.
Where as redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum.
two different types of ways of measuring light waves. Or are you suggesting that space is actually a solid crystal or viscous liquid?
well, space is filled with gasses and what have you. Maybe even liquids (water?) Plasma etc.why not?
You are assuming space is empty. It is not. So the argument is still valid.