I cannot say I believe that there is life out there. All I can say is that there are a number of reasons to think it is possible and that we have at our command the means of finding out. Those two things being the case, I would be very ashamed of my civilization if we did not try to find out.
—Astronomer Carl Sagan
FROM the first time he looked into the heavens and sensed that there were worlds beyond his own, man has sought to answer a haunting question: Are we alone in the universe? Although...
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