Do aliens exist? Everybody has ever wondered if there is life in other planets, and we have imagined anytime small little green men getting out of an UFO. (Unidentified Flying Object) Nonetheless, many people are reluctant to believe that there are different forms of life, or that there is not any civilization outside of our world. In spite of the fact that I have never seen an UFO, even, I have never met anybody who has seen it, I am pretty sure that there are planets which are able to house life. I don’t argue my thoughts by those secret files which have been classified for a long time and belong to organizations or agencies like FBI or NASA and, I don’t believe that a dark point, which you hardly can distinguish, on an old picture is an UFO, neither. I base my idea of alien’s life, on probability. It has been shown by renowned scientists that we are in an expanding Universe whose limits we have not found still. As far as we know about Universe, which are very few things, there is an incredibly amount of galaxies that own millions of stars and planets. So, my question is: Among that amount of planets, why can not it be possible that living conditions happen at some of them? I do not mean that these living conditions are exactly like we have on Earth, even, that those who live outside are intelligent ones (many of earthlings neither are). I am of the opinion that it may exist beings which are able to breathe nitrogen for example, or even breathing is not necessary for them, they would take the energy through its body’s surface or however. As I see, there are forms of life which probably won’t have to do anything with ours, but we don’t have the proper technology and means to find them out, unless they find us first.