There was a post a couple days ago where someone was staunchly asserting that space is not actually expanding and that objects really are moving away from one another kinetically, with multiple citations on the subject (which I didn't look too far into). There was a bit of discussion and a couple people agreed with them.

This was the first I'd heard about that. All modern material I've ever seen on astrophysics (the last twenty five years or so?) talks about the universe expanding.

How solid is the scientific consensus on this subject? Is it actually contentious at the moment, or was this person stating an belief that is currently kind of fringe?