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    Interstellar Travel

    How long will it be before we reach alpha centauri, i was on a thread on yesterday about going to mars and it interstellar travel came up. I figured you guys (and girls) would prob have a better idea on what ideas are out there right now. this was my post: do you know how impossibly...
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    The size of the universe

    How big is the universe? This has been really bugging me since I read an article that said it was 30 billion light years across. This, however, did not seem possible to me, if the universe is about 8 billion years old, then isn't the maximum size the universe could be 16 billion light years...