Circles

One day in the future, all mankind will receive a signal, and this signal comes from the moon. No one understands why this neighbor, which mankind has observed countless times and has never had any traces of civilization, would send out an intelligent signal. At this time, someone turned their attention to the interior of the moon. Since this signal first appeared in China, and it was also the country that launched the fastest detector, it initially proved that the interior of the moon is hollow. So far, a China-led lunar exploration mission cooperating with China, the United States and Russia has begun. This time the target is the interior of the moon, and they discovered something inside the moon... I really can't think of a title for the book, and it can't be the same name! Just call it "Zhu (Zhu) Circles (juan)"! ! ! !