What is "Three-body"?

Three-body, alias: Trilogy of the Past of the Earth. There are three books in Three-body: Three-body Earth Past, Three-body Dark Forest and Three-body Death Eternal Life. The author is Liu Cixin, and the three-body is a science fiction novel.

"Three-body" mainly writes that Ye Wenjie used the sun as a megaphone to send a signal to the universe, which was received by a three-body man. The three-body man is an alien, because their home planet has three suns, which are unstable for some reason and will collapse easily. The three-body people are preparing for interstellar migration, but the universe is so big that at first glance, it is dark everywhere, and I don't know what to do. Listen to the signal to see if there is any signal that can be connected, because the signal emitted by Ye Wenjie was received by the three-body people. (The signal sent is equivalent to exposing the coordinates.) The three-body people intend to invade the earth, which has led to the life-and-death struggle between human civilization and three-body civilization and the rise and fall of the two civilizations in the universe.

There is a sentence in the book that I will never forget: 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 feel that people are so small that nothing is worth mentioning.