Re the ?expanding universe? issue:

I see the statement as a sort of misnomer.
The theory is that distant galaxies appear to be moving away from us with speed increases related to their distance from us. Literally this only says that objects we see in the universe are moving away from us. This observation does not prove that the ?universe? is expanding, only that the content is in motion.

The point may not be important to those that think the ?universe is expanding? but the idea should be tempered to allow for a universe of infinite size into which objects are traveling away from us. To do otherwise automatically conveys the idea that the universe has an edge which is expanding, enlarging, while objects are going along with it. Also it now gives source to the idea that what we see of the universe content is all there is when we must be aware we have seen very little of it.
jjw