How many times was Trisolaran civilization destroyed?
More than 200 times. In Liu Cixin's Three-Body trilogy, the Trisolaran species does not have a single continuous history. It has a history that keeps getting wiped clean and started over. When Wang Miao enters the virtual "Three Body" game in the first book, civilizations flash past him numbered like save files — Civilization 137, 183, 184 — and the count climbs toward the high 190s. Each number is an entire society that clawed its way up from the stone age and was then annihilated. The trilogy makes it explicit: Trisolaran civilization was destroyed and reborn over two hundred times.
That number is not a metaphor. It is the exact measure of what it means to live on a planet with three suns.
Why does Trisolaran civilization keep collapsing?
Because three gravitating bodies have no stable, predictable orbit — the same real mathematical wall known as the three-body problem. Trisolaris drifts among its three stars, sometimes briefly captured by one (calm weather), sometimes yanked between all three (chaos). This produces two kinds of eras. During a Stable Era the suns rise and set on a rhythm and civilization can farm, build, and invent. Then a Chaotic Era arrives with no warning and no fixed length: decades of killing cold, oceans boiled by killing heat, or the horror of a tri-solar day when all three suns climb the sky together and scorch the surface to ash.
The cruelty is the unpredictability. A society that just invented writing can be frozen solid overnight. The alternation of Stable and Chaotic Eras is the root of every disaster in the Trisolaran story.
How did the Trisolarans survive if the planet keeps killing them?
They evolved dehydration — the ability to expel all their body water, roll up into a dry hide, and wait out a disaster in a dormant state, then rehydrate when a Stable Era returns. It is a brilliant survival trick for an individual. It is useless for a civilization. Dehydration can carry a body through a cold snap, but when a Chaotic Era burns everything or a sun drags the planet into fire, the dry hides burn along with the cities, the books, and the machines. Knowledge resets to zero. Survivors restart from stone tools. That is the mechanism of the 200-plus cycles: not extinction, but the repeated formatting of a civilization's memory. If you want the biology in detail, the full breakdown of Trisolaran dehydration covers how it works and why it fails at civilizational scale.
Why does this history explain the invasion of Earth?
Because two hundred deaths teach one lesson: leave. Each numbered civilization died differently — some shattered like porcelain in the cold, some vaporized in a tri-solar day. Civilization 184 even assembled a human-formation computer out of thirty million soldiers to try to predict the suns, and it was destroyed anyway. That endless futility shaped the Trisolaran character: coldly rational, stripped of sentiment, survival above everything. And it produced the final decision — abandon the untamable planet and reach for a blue world four light-years away with a single, stable sun. That is the deepest motive behind why Trisolaris chose to invade Earth: not conquest, but escape. The planet Trisolaris itself was never a home. It was a death trap they spent 200 civilizations learning to flee.