What Properties Might Light of Millennia Past Have that Today's Doesn't?

Thread copied here from the What Properties Might Light of Millennia Past Have that Today's Doesn't? thread in the Proposed New Topics forum.

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--	Percy
	EvC Forum Director

ForEverYoung, you were not permitted back in so you could pull your martyr act again. Please stop or you'll be indefinitely suspended, and I will veto any attempts to bring you back. I'm not really into second chances, and certainly not thirds.This thread has a topic, please confine yourself to that.

Hi Al,It takes two to tango. Since this digression onto the Big Bang is becoming much more lengthy than it could have been, it is probably best to drop the topic. The topic of this thread is whether light might have had different properties in the past than it does today.Since most of what I seem to be doing in this thread is seeking clarification and suggesting that people focus on the topic, I'm switching to my moderator role.

The topic is whether light in the past might have had different properties then it has today. Please stop discussing the Big Bang except in contexts where it bears on the topic.