Few scholars claim that smart life form perhaps exist on another planets such as Mars, and, Jupiter and many investors want to build up contact with them. The importance of lives on other planets increasing with leaps and bounds. But, other think that it is too determinal owing to they have hazardous weapons and techniques that destroy our earth. In my, opinion this has few advantages such as new technologies, information, spac knowledge, and, geography of place. And some disadvantage such as they are more devloped than us and they are not genuine or want to harm us. in this, essay we will further elaborate on the positive and negative effects of this concept and thus will lead to a logical conclusion.