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The It is also of current interest: like the Redshift-angular Size Relation, it is straight-forward given some simplifying approximations: in this case, constant. However, at Cosmological distances, various models as well as observation reveal it is not so simple, and observation can be used to select and tweak models. astrophysics,cosmology,measure)https://ned.ipac.caltech.edu/level5/Sept01/Sandage/Sand4.html https://arxiv.org/abs/1410.2469 |