- #1
nomadreid
Gold Member
- 1,668
- 203
I have read the advice of Nugatory and Jorrie in order to get me started on understanding cosmology; I have played around with the cited calculators (except http://www.einsteins-theory-of-relativity-4engineers.com/CosmoLean_A20.html doesn't open for me), without mastering them, and read for a few hours. It may take me until the Heat Death of the universe to understand much of it, but I will start with a couple of very elementary questions. I refer to the simplified graph in the attachment. (a) We are talking about the red line, I presume, based on present knowledge? (b) Is "relative size" referring to comoving distance diameter, the proper distance diameter, or a volume? ("Size" is ambiguous.)