> we define universe as having neither outside nor boundaries Do we? > boundaries There's one at the Big Bang. You can go through contortions to try to rem

> we define universe as having neither outside nor boundaries Do we? > boundaries There's one at the Big Bang. You can go through contortions to try to remove it (Hartle & Hawking's "no boundary proposal"; Carroll & Chen's "two-ways-to-de-Sitter from arbitrary initial surface") but so far attempts have come at the cost of introducing a lot more conceptual baggage. > outside "more of mostly the same" unless you think that one metre or one light year or two hundred million light years beyond the Hubble radius the universe is vastly different from the stars and galaxies we have around here. What could have happened to early galaxies that 200 million years ago were in principle observable from the Milky Way, such that they wouldn't now resemble the descendants of early galaxies that are 200 million light years closer to us?