I vote for cannot.Prometheus said:That is good, since we cannot observe the entire universe. Or, do you think that we can?
Yes.What are you saying? The speed of light is constant in space-time. Isn't that what your are trying to say?
A listing would be helpful. I am not aware of any such demonstrations.However, the speed of light is not constant in space or time, but only in space-time. There have been numerous demonstrations that the rate of motion of light through space is not constant. Neither is the rate of motion of light through time.
Agreed.It is only within the context of space-time that the speed of light is constant.
No, but, I have a lot of company.Do you understand the implications of space-time?
Yes.Do you think that the rate of motion of light through space is invariant, and that light can never move through space at a rate less than is commonly given for c?
Quite the contrary. I do think the speed of light is invariant... at least in my own way [GR].Of course you don't. So, what do you mean?