But this is extrapolation from appearances, is it not? What knowledge do we have that such a revolution has ever actually occurred, or will actually occur?
And such demurrals are on a par with the denial of the primordial significance of the observed CBR, so I don't see where you're coming from.
Are you saying that our galaxy must be at least several hundred million years old, so as to have accomplished a revolution or two, as it seems to be in the process of doing? But that the universe itself was only created who knows when, the CBR notwithstanding?
Well, I don’t know. You could jump off with a stopwatch and time it till I come around again:)