Light rays which reach us from a given point in a galaxy are parallel, or so near to it as to be absolutely, completely indistinguishable. Light rays which reach us from two different points of the galaxy are measurably not quite parallel. But it’s the former which is relevant here, not the latter.
So Chronos and QED are disagreeing with each other? I’ll step aside while you two sort it out.
I don’t see as we’re disagreeing at all; certainly Chronos is entirely correct. We’re saying essentially the same thing in different ways. Where do you see a disagreement?
I don’t recall seing that in Marilyn’s profile.
Nor do I see anything wrong with what Q.E.D. is saying.
Well, I guess I misunderstood what Giles was saying. I thought at first he was saying that the angle between light rays from opposite sides of a far-away galaxy is so small that it’s unmeasurable. But it’s clearly not, because imaging the galaxy is a measurement of that angle of the light rays.
But on second reading, I don’t think that’s what he was saying.