“Death’s End” by Cixin Liu (translated by Ken Liu)

This is the final novel in Liu’s “Remembrance of Earth’s Past” trilogy. Clocking in at over six hundred pages alone, this book brings the trilogy’s total page count to well over fifteen hundred. This story circles back on many of the philosophical themes of the previous books, with a continued emphasis on physics, cosmology, free will, and the nature of language. “If, as soon as you were born, you were locked inside a small box, you wouldn’t care because that was all you’ve known. But once you’ve been let out and they try to put you back in, it feels completely different.” Liu’s story also compels the reader ask what it truly means to be human. “Life reached an evolutionary milestone when it climbed onto land from the ocean, but those first fish that climbed onto land ceased to be fish. Similarly, when humans truly enter space and are free from the Earth, they cease to be human.” This novel’s time scale is also even more epic, with over eighteen million years elapsing during the course of the story. “The known universe is about sixteen billion light-years across, and it’s still expanding. But the speed of light is only three hundred thousand kilometers per second, a snail’s pace. This means that light can never go from one end of the universe to the other. Since nothing can move faster than the speed of light, it follows that no information and motive force can go from one end of the universe to the other. If the universe were a person, his neural signals couldn’t cover his entire body; his brain would not know of the existence of his limbs, and his limbs would not know of the existence of the brain.” However, as in his past novels, this story also remains rooted in the specific lives of a few core characters, who are able to transcend time and keep the reader rooted in humanity’s journey. “This wasn’t a decision born of thought, but buried deep in her genes. These genes could be traced to four billion years ago, when the decision was first made. The subsequent billions of years only strengthened it. Right or wrong, she knew she had no other choice.” This is a novel that makes one deeply ponder the meaning of humanity, the meaning of the universe, and the meaning of time, as well as the meaning of an individual life. “The child that was human civilization had opened the door to her home and glanced outside. The endless night terrified her so much that she shuddered against the expansive and profound darkness.”

“The Dark Forest” by Cixin Liu (translated by Joel Martinsen)

Liu’s science fiction trilogy succeeds in combining realistic contemporary physics, plausible futuristic extrapolations, historical eastern philosophy, and cultural sociology all within a grippingly mysterious narrative. This novel continues the story of “The Three Body Problem”, but most of the main characters are new, even as humanity’s existential threat remains. Ye Wenjie reappears in the opening pages of the novel, coining a new field in the social sciences, and setting the table for the rest of the plot, in her usual enigmatic fashion. “Suppose a vast number of civilizations are distributed throughout the universe, on the order of detectable stars. Lots and lots of them. Those civilizations make up the body of a cosmic society. Cosmic sociology is the study of the nature of this super-society…. Setup a few simple axioms at first, then derive an overall theoretic system using those axioms as a foundation…. First: Survival is the primary need of civilization. Second: Civilization continuously grows and expands, but the total matter in the universe remains constant…. To derive a basic picture of cosmic sociology from these two axioms, you need two other important concepts: chains of suspicion and the technological explosion.” One constant in Liu’s novels is the reminder that humanity is still extremely young in the timespan of the universe. “The outcome of natural biological evolution requires at least twenty thousand years to manifest itself, but human civilization has just five thousand years of history, and modern technological civilization just two hundred. That means that the study of modern science today is being done by the brain of primitive man.” The novel’s protagonist, Luo Ji, warns, “Everything has an ending. The sun and the universe will die one day, so why should humanity believe that it ought to be immortal?”

“The Three-Body Problem” by Cixin Liu (translated by Ken Liu)

This is “hard” science fiction at its best. It is an epic novel that combines the best of realistic science, actual Chinese history, and world-leaping fantasy. Over the course of the story, realistic nuclear physics, computer science, virtual reality, and extra-terrestrial communications are all seamlessly woven into a compelling narrative. Space and time hop back and forth. The story begins in the depths of the Cultural Revolution, when Chinese intellectuals were being rehabilitated, punished, or worse. “But burning was their fate; they were the generation meant to be consumed by fire.” The story soon shifts to forty years later and to physicists on the frontier of contemporary science. “Theory is the foundation of application. Isn’t discovering fundamental laws the biggest contribution to our time?” But there were also humans opposed to this scientific progress. “He believed that technological progress was a disease in human society. The explosive development of technology was analogous to the growth of cancer cells, and the results would be identical: the exhaustion of all sources of nourishment, the destruction of organs, and the final death of the host body.” On Earth, scientists start dying under mysterious circumstances. A secret society (or two) is revealed. Superpowers collaborate. There is also much philosophy interspersed with the hard science. “The more transparent something was, the more mysterious it seemed. The universe itself was transparent; as long as you were sufficiently sharp-eyed, you could see as far as you liked. But the farther you looked, the more mysterious it became.” As the mystery of this novel unfolds, the story envelops you even as the technical details of the science impresses.