i don't really believe that aliens exist , their only basis why this kind of creatures exist is from movies but for me this creatures are all fan man made ,most people believe that aliens are true and most people they saw one of them , like UFO that was flying in the sky , maybe if saw one with my two eyes , that is the time i will believe that they really exist.
Once these puzzles are solved, we may have finally proved that aliens exist - or got one step closer to discovering that humanity is the only lifeform in the universe.
Of course, we won't know whether extraterrestrials are real until they get in touch with us or we find evidence of their existence.
And even if we do find alien life, it might be in the form of bacteria or other microorganisms, rather than fully fledged intelligent beings.