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Ten years ago, an unknown virus swept the world, and three billion lives fell like a meteor. It destroyed the world order and crushed human confidence and hope into dust. For the first time, human beings felt the killing intent from the depths of the universe. For the first time, humanity was forced to unite and look into space. Ten years later, the surviving humans once again faced catastrophe, and this time, they came in person... Where does human civilization start? What is the future of civilization on earth? In the face of a god-like enemy, can mankind keep the fire of civilization? ................................................ There is no time travel, no rebirth, and no golden finger. This is an attempt at hard science fiction. This is a tribute to teacher Liu Cixin. Thank you all for reading, the first part of the Civilization Revival series, Once Upon a Time on Earth.