Is the Hubble Constant the Same Everywhere in Space?

He said that the expansion of the universe is the same everywhere in space. Is that really true? I mean, aren't there spots in space that are denser than others? Wouldn't the maybe the expansion be a little uneven? Well, that's a great point. We think it's totally homogenous. It doesn't vary with space. Does vary with time because it depends on the overall density of matter and radiation in the universe. And that does evolve. But we don't think it varies with space. So certainly possible that dark energy could be doing different things in different parts of the universe. Yes, we're assuming that. The Hubble constant, we think is constant across space