Are We Alone in the Universe?

I'd like to know what do you think about so-called flying saucers. Is there any truth in the hypothesis that some beings from another planet visited the earth in the past and left traces of their highly developed culture and technology, like the pyramids of Gizeh in Egypt, Stonehenge in Great Britain......

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  • “Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying.” ― Arthur C. Clarke

    Happy?

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