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I personally don't really think aliens have come here. Time is as important as distance. The universe is enormous and its likely the time it would take to traverse those distances make travel improbable. But I do think there have to be, or will be, or has been other life. Anything else is just retarded. I remember reading a guy doing an equation that took all of these crazy factors into account, and it left like one tenth of one millionth of one percent as planets that would have life, some crazy low fraction. It still meant that there were literally millions of planets that would have life. I just think we will never see each other, which is sad.
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