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Verne; the idea of stretching avoids the problem of exceeding c, doesn't it? Metres per second is still the same -it's just that the metres may have changed.??
We're back to my difficulty with the "what's really happening?" type of question. They are all just models of reality, as we see it. If the model works and is consistent then I don't think we can ask much more of it. When another model comes along which includes all the present phenomena - plus a few new ones - we can use it. But we may not be able to reconcile our present model with the new phenomena.