宇航员终其一生只为登月，当他踏上月球的那一刻，地球却爆炸了。面对着只剩下一个人的人类文明，他做了什么样的选择？

The astronaut made lifelong efforts for moonfall. The moment he set foot on the moon, the earth was exploded. What kind of choice he has made when facing the human civilization only left for one person?