Recent content by ash73

Sorry I edited my post while you were replying, but I think I've understood the point you are both making.

Yes, and what I'm asking for is a clarification of how far apart they "really" are. I think I'm hearing it's indeterminate ([edit]: the proper distance is "real" in the sense you really would have to travel that far to get there, but it's complicated by GR frames of reference etc), but now I'm...

I don't understand; enter a galaxy's redshift and it calculates the proper distance... http://www.einsteins-theory-of-relativity-4engineers.com/cosmocalc.htm Can you please clarify?

That wasn't my intended meaning, I was trying to understand whether the mathematics could be translated into an understanding of what is actually happening in physical reality. It seems as impossible as imagining what an atom looks like; the maths helps us predict stuff but that's all. 1 and 2...

I like the "Misconceptions about the Big Bang" article written by Prof Tamara Davis included as a footnote in your balloon analogy page, I watched her lecture on cosmic horizons on YouTube yesterday, it was excellent. bapowell's point about inertial frames made the penny drop. At the risk of...

Thanks, it makes more sense with that explanation. I think the problem is I've been taking layman's guides too literally; balloon analogies and talk of new space being created is actually getting in the way of my understanding.

Interesting comments thus far. I've read the wiki page on metric expansion and I don't understand it. For example, I don't understand how the gravitational attraction between galaxies* decelerated the expansion of the early universe, if expansion is just a feature of the metric scale between...

Hi all, newbie fascinated with relativity and cosmology, plus a bit of astronomy on the side (skywatcher 200p). I spend far too much time watching Lawrence Krauss vids on YouTube, and wanted to ask a few questions here.

Hi, newbie reading the forum with interest, and trying to understand how expansion manifests itself physically. Four possibilities; 1. New space is created between existing space, pushing galaxies apart 2. Existing space is stretched, pushing galaxies apart 3. Empty space is nothing, and...