> In the absence of evidence that something else is causing the redshift, the assumption should be that it is a result of things moving away from us. But that

> In the absence of evidence that something else is causing the redshift, the assumption should be that it is a result of things moving away from us. But that is not what our best current model of the universe actually says. Our best current model of the universe says that the observed redshift of a distant object tells us by what factor the universe expanded between the time the light was emitted and now (when we see the light). Viewing it as a Doppler shift is an approximation that only works for small redshifts (much less than 1).