Abstract
``Power-law cosmologies'' are defined by their growth of the cosmological scale factor as ${t}^{\ensuremath{\alpha}}$ regardless of the matter content or cosmological epoch. Constraints from the current age of the universe and from the high redshift supernovae data require ``large'' \ensuremath{\alpha} (\ensuremath{\approx}1). We reinforce this with the latest available observations. Such a large \ensuremath{\alpha} is also consistent with the right amount of helium and the lowest observed metallicity in the universe for a model with the baryon entropy ratio $\ensuremath{\approx}8.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}.$
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