I think it would be very pretentious of us to believe that we are the only living beings in this universe! I have always taken for granted that extraterrestrials exist and that they are even much more intelligent than some of us who live on earth. LOL. In fact, I remember reading that the intelligence of extraterrestrials was proportional to their distance from the Sun; hence, there would be an enormous variation between the inhabitants of the different planets, from the "clumsy Mercury settlers" to the "ingenious Saturn beings". In this case, I think we should not ask ourselves if they exist but how do we find them or have them find us. Greetings and interesting topic, @dedicatedguy