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I am reading The Essential Cosmic Perspective and there says "We cannot observe light coming from anything more then 14 billion-light-years away".
( In my opinion this statement is wrong cause observable universe diameter is 46.5 billion light years. I guess authors meant something else, or Am I misunderstanding something ? )
Universe created/started 14 billion years ago so we cannot see beyond that timeline.Cause of that we have a limit of things that we can see. Now we are not in the center of the universe so my question can be awkward but an observer in 12 billion light-years away would see the same "observable universe" in size perspective or maybe also in some other perspectives ?
1-The confusing part is when we go further we go past in space so 12 billion light years away means 12 billion years ago so in that time universe was not as big as it's now.In that case the answer would be no.
2-In the other hand since "we are not in the center" according to him we are 12 billion light years away so the size of the observable universe will be the same.
I believe 2 is the correct answer.
Also every moment the radius of the observable universe increases but it does not mean anything cause in the edges of the observable universe there's nothing but CMB radiation
Thanks.
( In my opinion this statement is wrong cause observable universe diameter is 46.5 billion light years. I guess authors meant something else, or Am I misunderstanding something ? )
Universe created/started 14 billion years ago so we cannot see beyond that timeline.Cause of that we have a limit of things that we can see. Now we are not in the center of the universe so my question can be awkward but an observer in 12 billion light-years away would see the same "observable universe" in size perspective or maybe also in some other perspectives ?
1-The confusing part is when we go further we go past in space so 12 billion light years away means 12 billion years ago so in that time universe was not as big as it's now.In that case the answer would be no.
2-In the other hand since "we are not in the center" according to him we are 12 billion light years away so the size of the observable universe will be the same.
I believe 2 is the correct answer.
Also every moment the radius of the observable universe increases but it does not mean anything cause in the edges of the observable universe there's nothing but CMB radiation
Thanks.