The most distant galaxies we can see are about 13.8 billion years old, and because of the expansion of the universe they are thought to be about 46 billion light years away, giving an estimated size of the universe of ~93 billion light years in diameter. But if I was in one of those distant galaxies, would I see more galaxies in every direction that are 46 billion light years further out? And wouldn’t this be repeatable forever?
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Yes, but you wouldn’t see other galaxies that are behind earth from there. The size is always the same (as far as we know) but wich parts of the whole universe fall into your observable universe differs by location.
Probably. It depends on how the expansion of the Universe works. If it’s uniform everywhere (the simplest model, and one that appears to be very close to the truth in *our* observable Universe), then yes. If not, it could vary from point to point, or even direction to direction.
We can’t know, because we’ve never gotten significantly far away from our planet to tell. However, we have no reason to believe that if you went to anywhere in the visible universe that you’d see anything but more universe around you as far as you can see just as we do here.
Yes, everyone is at the centre of their own observable universe. As far as we can tell, the universe looks to be mostly the same pretty much throughout, so there’s no reason to think that the general shape or density of it would change much depending on where you are.
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