I have had plenty of conversations with friends about the possibility of extraterrestrial civilizations. Sometimes one argument arises: If there are other civilizations and the evidence of unknown flying craft some people have managed to take pictures of, why haven't they come down and introduce themselves to us?
Well, at the end I posted a video with the explanation, but I'll write some of the things I believe. We are being watched, studied, because as we have attained high technological advances, we are IMO still too arrogant and maybe that these external civilizations are waiting for us achieve a Type 1 civilization. Anyway, watch the video and leave some comments if you want:
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