Is that true that the edge of the universe is 140 billion light years from Earth?

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don't judge me yet! I saw a documentary on National Geographic channel,something like,a week in the space,or kind of.It says that the edge of the universe is about 140 billion light years from earth! but i think its just pure guess! they just simply don't have how to know where is the edge of it! opinions?
sorry 4 my bad english
 
The real question is, when you get to the edge of the universe, what is on the other side?
 
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