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Redshift also occurs to light emitted from within a gravity well. Obviously that isn't what's happening at a cosmic scale (our light isn't blueshifted to other
by scatters 4y ago
Redshift also occurs to light emitted from within a gravity well. Obviously that isn't what's happening at a cosmic scale (our light isn't blueshifted to other observers) but it's at least conceivable that some third phenomenon could be the cause.