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My guess is that it would tend to unite us. It seems to be part of our nature to find unity in contrast to something that is different. If we find life somewhere else, we can then only assume that there are countless other places where life exists and has evolved, and that we will find more life in time. Our place in the cosmos will be powerfully defined by that knowledge, as we become one example of many, and our fate is ours alone to be compared to that of others.