The Alien

        The Extraterrestrial civilizations study is very useful for the human community and the Earth. The study of alien will help us protect our self from other life forms. After human get in the space or get out of the Solar system, it is more important to defend our planet,and it is very useful for the human science and technology. For example, if we find the Aliens, we can build a diplomatic relations with them on the trade side, technology side and science side. If they are not friendly, we can discover it earlier and start to deploy some military defense to defend the human beings There is no danger when there is preparedness. We can stabilize the status of the human in the universe.