I saw that one of the ways scientists calculate the Universe's age is by seeing how far away they can see, then taking that distance in light years as the Universe's age. I saw that the farthest they can see is about 15 billion light years. My question is, doesn't that prove the universe is actually at least 30 billion years old.
If the universe is expanding, then it would take 15 billion years for the universe to get 15 billion light years big (assuming expantion at the speed of light) and then another period of time for objects to form out there, then another 15 billion light years for the light to get back?
I usually assume if smart people with more knowledge on a subject say something that to me seems obviously wrong, it is that I missed something subtle they know. So what am I missing? Could someone please help?
2006-12-26
20:53:16
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Astronomy & Space