This chart made by Toby Ord shows four things:
• Everything we can observe now is the ‘observable universe’.
This is a companion discussion topic for the original entry at https://johncarlosbaez.wordpress.com/2023/03/26/four-universes/
This is a companion discussion topic for the original entry at https://johncarlosbaez.wordpress.com/2023/03/26/four-universes/