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First, some definitions. The limits of observability in our Universe are actually set by cosmological horizons, of which the "observable Universe" is just one type. These depend on not only whether can we detect the thing from Earth, but also on when was the signal produced? There are various types of cosmic horizons: The particle horizon sets a ...


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tl;dr Their redshift would first decrease from $\infty$ to $\sim60$, then increase to $\infty$ again. And more eventually appear. The answer to this question is somewhat non-trivial, and will depend on the cosmology of the universe you're considering. But in our Universe, in which dark energy supposedly accelerates expansion, what happens can be summarized ...


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