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A quiet radio astronomer, Ye Wenjie, makes a fateful decision during the Chinese Cultural Revolution by sending a message into space. Little did she know, this act would echo across light-years and determine the fate of humanity.
This signal reaches Alpha Centauri, a star system only 4 light-years away. However, unlike our stable solar system with one sun, Alpha Centauri hosts three sun-like stars.
In our solar system, Earth orbits one sun in a predictable path, giving us stable seasons and conditions for life. This is called a "two-body problem" in physics, and it's relatively easy to predict.
A planet in a three-star system faces the "three-body problem." The gravitational pulls of three suns make its orbit chaotic and unpredictable. Sometimes it's scorching hot, other times freezing cold, or it might even be flung into space!
For the alien civilization called the Trisolarans, their home planet experiences extreme "Chaotic Eras" and "Stable Eras." During Chaotic Eras, their world might burn, freeze, or face orbital instability, wiping out civilizations repeatedly.
They developed unique ways to survive these brutal periods, even "desiccating" themselves into thin sheets to withstand the extreme cold or heat, rehydrating when conditions improved.
Ye Wenjie's message offers them hope: a new, stable home. The Trisolarans decide to invade Earth. But how do you cross 4 light-years and prepare for an invasion? They use "Sophons."
Sophons are supercomputers folded down from 11 dimensions to 2. Imagine taking a sheet of paper and folding it repeatedly until it's smaller than an atom. These Sophons can travel at nearly the speed of light.
Sophons are sent to Earth to spy, block scientific progress, and create illusions. They essentially "blind" human science, preventing us from developing defenses strong enough for the coming Trisolaran fleet, which will take centuries to arrive.
The Sophons, while incredibly advanced, can't stop everything. Humans on Earth begin to prepare, forming a "Wallfacer Project" where a few individuals are given immense power and resources to devise secret strategies against the Trisolarans, without anyone else knowing their true plans.
To counter the Wallfacers, the Trisolarans empower their own human sympathizers, called "Wallbreakers," who attempt to decipher and expose the Wallfacers' hidden strategies, creating a complex psychological war of wits.
Humanity's initial response involves building a massive space fleet, but they soon discover the terrifying power of the Trisolarans' advanced technology. The "Droplets," probes made of an indestructible material, effortlessly slice through Earth's most powerful warships.
Human science might be crippled, but human ingenuity is not. The concept of the "Dark Forest" emerges: in the vast cosmos, any civilization that reveals its location becomes a target for destruction by others, for self-preservation.
The true terror isn't just the Trisolaran fleet, but the universe itself. Advanced civilizations use "dimensional weapons" to reduce entire star systems to fewer dimensions, making them uninhabitable. Imagine a 3D world being flattened into 2D!
One strategy born from desperation is to use the Dark Forest principle against the Trisolarans. By threatening to broadcast the location of the Trisolaran home system to the universe, humanity gains a temporary, fragile deterrent.
However, the universe holds even greater threats. Our sun itself is eventually "photographed" by an unknown, highly advanced civilization, marking it for destruction by a light-speed attack. The end is inevitable.
Ultimately, the only true escape is to abandon the universe as we know it. Some characters seek refuge in "pocket universes" or manage to flee to distant, untouched corners of the cosmos, but even these safe havens are fleeting.
The universe, once thought vast and empty, is revealed to be a "Dark Forest" where survival means silence and hiding. The Trisolaran invasion was just a small part of a much larger, more dangerous cosmic reality.
Through these epic struggles, humanity learns that the universe is not a friendly place, and our existence is precarious. The "Three-Body Problem" is not just about a chaotic orbit, but the ultimate challenge of survival in a vast, indifferent, and dangerous cosmos.