I have come to accept that I do not and almost certainly cannot understand spacetime. I cannot fathom the consequences of the passage of light through circumsta

I have come to accept that I do not and almost certainly cannot understand spacetime. I cannot fathom the consequences of the passage of light through circumstances. I do not see how the concept of 1 Billion years can be thought to apply universally; how the Universe can have an age when as I understand it, time is circumstantial and potentially as meaningless as speed without a point of reference.