This is one of my favorite Hubble pictures (there are many). The galaxies shown are not actually colliding. They're actually about ten times the distance apart than the distance between the Milky Way and Andromeda, and it's just chance that they've aligned in such a way that we can see the nearer one highlighted by the background one.
It's been a while since I posted last. My apologies. I've done some reading to report on, and lots of thinking about the new book, with some stuff seeming to come together in that direction. We'll see how it goes. Next post will hopefully be soon.
Enjoying what seems to be a normal June, though May was significantly drier than usual.