 Melia and his students have developed the so-called Rh=ct Universe, a cosmological theory that, they argue, has accounted for the observational data better than all other models proposed thus far.In this cosmology, the Universe has no horizon problem, and therefore evolved without inflation.Melia's cosmology is notable for its simplicity and its adherence to the symmetries implied by the Friedmann-Robertson-Walker metric, which require the comoving frame to be inertial.