I am not trying to be cute or disrespectful but I have been thinking about all of this and must ask
.....When one throws a pebble in a pond the waves seem to legthen the further from the impact point ...I will go to the dam and check that my recollection is correct... but the pond is not expanding and yet the lenghting of the wave is apparent...the further the wave travells the more the wave lenghtens so why would something similar not apply to a light wave thru space...I mean if we took away the notion that the Universe is expanding does not the pond example point to a different explaination as to why the wave changes over time... as I said the pond does not expand but the wave lenghtens...
Could it be that similar happens with light in the Universe
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alex