I'm not sure about UFO's.
I don't have the knowledge that some of the respondents above have on the subject.
It just seems to me, that it stands to reason that there is life out there. There are "inhabitable" planets and systems. And if there is life, there is probably an evolution to some sort of defined intelligence.
Whether or not this leads to "advanced civilizations" I don't know. Do we live in an "advanced civilization?" I do believe that if we ever find life elsewhere, it will look like something even Hollywood can't imagine. Different physics, different evolutionary needs, different climates, etc.
Until then, I'll agree with Daval. I second the 42.
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