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Do we know if light is red-shifted by traveling through space? If it isn't, how do we know? I guess my pondering has lead me to wonder if the observed accelerating space-expansion is a misinterpretation. If light is red-shifted by traveling through space, we may be able to re-interpret Hubble's equation (I know, that might be heresy) as

$redshift = SomeConstant*d$ which would imply that distant objects aren't necessarily accelerating, the light we view is increasingly redshifted for more distance objects, independent of them moving away from us. Then, maybe we don't need dark energy anymore.?.

S Bateman
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This is essentially the tired light theory. It does not, for instance, explain the apparent brightness change with distance of similar objects: if tired light is true it should remain constant, while if objects further away are receding from us it will be lower, which in fact it is.

It's horridly incompatible with GR. There are other tests it also fails.

There are undoubtedly people who still think this model is the right one, but not many, I think.