Throughout the whole human history, people in different periods never gave up to explore the mystic cosmic world. We really want to know where we were from, who we are and where we are going to? These three confusing questions promoted many people tried their best to leave the earth and find out the truths. Unfortunately, we are just able to get to Mars now. In fact, we have two strong opposite feeling about the out space. We sometimes feel scared about the dark fron the universe, but sometimes we are proud of living on the only planet which has a variety of creatures. The scared feeling makes us imagining other creatures living in other planets. We usually think that they are stronger and more powerful than us. They look very ugly and evil. The proud feeling inspires us build a better home and courageously explore the out space. Generation to generation, we continue to do the same things about the universe. I have a different opinion, if we know all about the universe and find aliens, what we will do next? K*ll them or make friends with them? What are our purposes of coming into this world at the moment?