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Because the term 'Hubble flow' is more about a relationship between distance and velocity, it might not have meaning to describe the flow itself as having any particular speed. Hubble flow encompasses the observed expansion of matter in the universe; the further away a galaxy is, the faster it appears to be receding from us, measurable by the redshifting (Doppler effect). This would tend to imply that at the most extreme distances, galaxies may be receding from us at velocities approaching the speed of light, and would thus be redshifted into invisibility and become unobservable, thereby placing a boundary on the visible universe; however, this effect is difficult to detect due to the extreme distances involved.

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