Re: Where are they moving to?
"A good starting point is understanding the Observable Universe."
And that's supposed to help? viz:
"However, due to Hubble's law, regions sufficiently distant from the Earth are expanding away from it faster than the speed of light (special relativity prevents nearby objects in the same local region from moving faster than the speed of light with respect to each other, but there is no such constraint for distant objects when the space between them is expanding; see uses of the proper distance for a discussion) and furthermore the expansion rate appears to be accelerating due to dark energy."
I've been struggling with this kind of cosmic stuff for decades. See also: https://en.wikipedia.org/wiki/Shape_of_the_universe
It's all inside your head, and my head, and his head and her head. Boggle