我们对于未知的事物总是充满了好奇与遐想，奥妙无穷的茫茫宇宙更是任由我们思想的驰骋。我们对于宇宙的认识，已经由开始的神话传说走向了科学的探索，但是宇宙中依旧存在着许多我们无法解释的事物。除了地球之外，其它的星球是否也有生命物体的存在？关于UFO的频频的报道，是否真有外星人做客了地球？外星人与人类的文明的发展是否有着密切的关联？(We always have curiosity and imagination for the unknown. Our thought can freely gallop in the mysterious and vast universe. Our understanding of the universe has gone from the myths and legends at the beginning to the scientific exploration. However, there are still a lot of things that we cannot explain in the universe. In addition to the earth, is there also the existence of living objects on other planets? About frequent reports on UFO, are there really aliens that visited the earth? Is there a close association between the alien and the development of human civilization?)