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The State of Galactic Spacetime

How is a galaxy able to act as a single system such that we observe this unified effect? That is, when we look at another galaxy, what we see is the result of light being emitted from millions to trillions of seemingly discrete stars,28 yet we do not see a variety of redshifts: rather, we see one intrinsic redshift of the whole system.29 Since the galaxy as a whole possesses this intrinsic redshift, how does each individual star of that galaxy ...