First of all, Thou Shalt Not use several frames of reference at once unless you know what you’re doing or you risk being badly confused.
I think that this is important; I have come to suspect that I am somewhat confused.
I think you are trying to apply to Minkowski spacetime an intuition that only applies to Galilean spacetime
This is more than likely correct. I would also note that I have been applying, over very long (intergalactic) distances, the assumption that there is no expansion, which is clearly wrong. I suspect that I should probably look more into General Relativity before continuing along this train of thought.
I would also note that I have been applying, over very long (intergalactic) distances, the assumption that there is no expansion, which is clearly wrong.
Andromeda is nowhere near so far away that the expansion of the universe is important. (In fact, according to Wikipedia it’s being blueshifted, meaning that its gravitational attraction to us is winning over the expansion of space.)
I think that this is important; I have come to suspect that I am somewhat confused.
This is more than likely correct. I would also note that I have been applying, over very long (intergalactic) distances, the assumption that there is no expansion, which is clearly wrong. I suspect that I should probably look more into General Relativity before continuing along this train of thought.
Andromeda is nowhere near so far away that the expansion of the universe is important. (In fact, according to Wikipedia it’s being blueshifted, meaning that its gravitational attraction to us is winning over the expansion of space.)