Starship Asterisk*

Regarding: NGC 4676: When Mice Collide The text talks about things happening in slow motion when giant galaxies collide. How fast are things realling happening from the perspective of the center of each galaxy. And from the persective of a sun like position within each galaxy. How fast (speed) is th...

Also a non-mathematician, non-astrophysicist, but an amateur astronomer, not only did I note that illustration to be uni-directional from a central point, I am also curious as to where that point is? Theoretically, was the Big Bang from a specific point in time/space? Or did it happen everywhere all...