[Telepathic Intruder]

"all these galaxies should be moving close to parallel"

Yes, that's right, at about 80% the speed of light due to cosmic expansion, which I'm sure they took into account. But is that our speed away from it, or its speed away from us? Both, actually. There is no absolute space/time reference frame, so they say.

[sit-rep]

I know I’m asking the practically impossible to answer to my liking, it just boggles my mind that they appear to be telling us they are that good at determining what is happening billions of light years away. I mean really... Say these 2 or 3 colliding galaxies are actually millions of light years apart and due to their SIZES they appear colliding with red shift detection but in actuality they are passing one another...

Billions of stars in these galaxies and in the past 10 or 20 years were not seeing mega supernovas out of this collision? Christ if a couple super suns out with their gravitational pulls colliding with each other should light up half the universe!!