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The farther away things get, the faster they go. At the edge of the universe, they are going at the speed of light and (for all practical purposes) leave the universe and we can't know anything about them, nor could we reach them because they would always be going a little faster than we could. Asimov wrote that stars and galaxies would also be paper-thin at the edge of the unvierse, as well as moving at the speed of light, and he was using the best science of his time--but that can all be thrown out and rewritten at any time.
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