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Like all myths, there is some basis in fact. In fact, UFO's have been documented for years, centuries even, if some cave drawings are to be taken literally.
Personally, I don't see what the problem is. The galaxy is an extremely large place, with an extremely large number of stars, similar to our own. Why is it so hard to believe that there would be life somewhere else out there, and that they developed a long time before we did?
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