What is the main content of Three-body?

Three-body, alias: trilogy of the past of the earth. Three-body has three books: Three-body Earth Past, Three-body Dark Forest and Three-body Death and Eternal Life. The author is Liu, and Three-body is a science fiction novel.

"Three-body" mainly wrote: Ye Wenjie used the sun as a megaphone to send a signal to the universe, which was received by a three-body man. Three-body people are aliens because their home planet has three suns. For some reason, these three suns are unstable and easy to collapse. Three people were preparing for interstellar migration, but the universe was so big that it was dark everywhere at first glance, and I didn't know where to immigrate. Listen to the signal and see if there is any signal that can be connected, because the signal sent by Ye was received by the Santi. (The signal sent is equivalent to the exposure coordinates. The three-person plan to invade the earth, which led to the life-and-death struggle between human civilization and three-person civilization, and the rise and fall of the two civilizations in the universe.

One sentence in the book is the most unforgettable: life on earth is really an accident in the universe, and human beings are the only ants in this empty hall. Sometimes I feel that life is precious and everything is as heavy as Mount Tai. Sometimes I think people are so small that nothing is worth mentioning.