UFOs

I believe that everyone has wondered if there is more life in others planets ... and nobody,  in a long time, has been able to give an answer accurate and official. I arise other question: Will we, someday, be able to confirm their existence? or are very intelligent beings that we could never discover? or just has been an invention of man to give answer to unusual events?

In my opinion it is impossible to be the only specie in a universe so inmense, also my grandfather have told me some stories; ones in a journey to north he saw a strange light in the sky, wich moved quickly in a specific area. I have never saw something like that but there's so many UFO stories that has happened and watched in the clear north sky of our country.