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Old 31st December 2018, 08:31 AM   #48
lomiller
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Join Date: Jul 2007
Posts: 13,208
Originally Posted by Roboramma View Post
One of my favourites is that if you look at a spot 13 billion light years away in that direction:
<--------------------

And look at another spot 13 billion light years away in that direction:
--------------------->

You will be looking at two points that are (well, were) much closer to each other than they are to you.

point 1 <----------13 billion light years------------- you -------------13 billion light years------------> point 2

Weird right?
In fact, I think those two points are actually only tens of millions of light years apart, but don't quote me on that.
I thought the 2 points would be about 45 billion light years apart? IOW the size of the visible universe is ~45 billion light years across even though we can see ~13 billon light years in any given direction.
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