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Human beings are short-lived and insignificant to the earth. The earth has a history of 4.5 Billion years, and humans have only appeared for less than 3 million years. About 25 million years ago, there was a group of ancient apes living in trees, from which the early ancestors of humans gradually evolved. About 2 million years ago, human evolution entered a critical stage and Homo erectus appeared. About 300,000 years ago, [Homo sapiens] appeared in Africa. About 60,000 years ago, [Homo sapiens] began to migrate out of Africa and gradually spread [around the world]. About three thousand years ago, there were clear written records, and then there was the modern concept of "human beings". Since then, human beings have been "lonely". We seem to be just a "miracle" of life and a "passenger" in the long life of the earth. So we archaeologically excavate history, so we develop aerospace technology and explore the universe. We seem to be eager to have "similar people" or to prove our own "existence" in order to eliminate this "loneliness". But is this really the case?