The ETO Founding

Lore & Background

The Red Coast Base was a secret Chinese radio-astronomy installation built to detect extraterrestrial signals, and during the Cultural Revolution it became a place of political purges, violence, and despair. Ye Wenjie, a brilliant physicist whose father was killed in the political upheaval and who herself endured brutal beatings by the base's workers, found herself alone with the great dish array and the vast, indifferent cosmos. It was in this isolation that she detected the structured signal from Trisolaris, a world orbiting a chaotic three-star system where life had been nearly wiped out countless times by gravitational instability.

The Trisolarans, desperate and ancient, had been broadcasting a beacon into the void. Ye Wenjie responded. In return, the Trisolarans transmitted a warning to the rest of humanity: do not answer, for they would come. But Ye Wenjie had already made her choice. She had been betrayed by the very species she was supposed to protect, and the Trisolarans offered her something humanity never had: a future that did not require her to trust her fellow humans. She became the first and most powerful member of what would become the Earth-Trisolaris Organization, a secret network of those who believed humanity was beyond redemption and that the Trisolaran arrival was not an invasion but a salvation.

Over the decades, the ETO grew and fractured. The Admirers, the more radical wing, actively worked to undermine humanity's scientific and technological progress, sabotaging the Particle Accelerator project and other key initiatives to ensure that when the Trisolaran fleet arrived, humanity would be helpless. The Redeemers, by contrast, focused on preserving Trisolaran knowledge and preparing a spiritual and cultural bridge for the incoming civilization. Both factions operated in the shadows, recruiting through the enigmatic 'Three-Body' game that appeared on the internet in 2007, a game whose impossible physics and shifting rules were, in fact, a direct transmission of Trisolaran reality. The ETO's existence was a secret kept for decades, a ghost in the machine of human progress, and its eventual exposure would become the catalyst for the entire crisis that defines the trilogy.

In Their Own Story

The dish had been silent for three days. Not truly silent—there was always the thermal hiss of the desert night, the groan of the antenna structure settling in the cold—but the structured silence. The kind that meant no one was listening. Ye Wenjie pressed her forehead against the cold railing of the observation platform and watched the three stars of Trisolaris resolve in the spectrograph readout, their chaotic dance a slow, maddening waltz that no human sky could ever replicate.

She had sent the reply six months ago. The coordinates. The invitation. The small, terrible word that meant: *come*. And now the warning had come back, broadcast on every frequency, meant for every human ear. *Do not answer. We will come.*

She looked at the faces of the workers below, their red armbands catching the sodium light, and felt nothing. Not rage. Not fear. Just the flat, exhausted certainty of a woman who had been beaten for believing in a species that had beaten her. The stars above did not care. The stars above did not lie. And the stars above would come, and when they did, the screaming would finally stop.

She turned back to the console. There was more to send.

Reader's Guide

Cultural Revolution, early 1970s: Ye Wenjie, a purged physicist, is assigned to the Red Coast Base in Inner Mongolia. The base's radio array, originally built to detect alien signals, picks up a structured transmission from Trisolaris. Ye Wenjie responds. The Trisolarans broadcast a warning to all of humanity: they will come. Ye Wenjie, shattered by the violence of the era and her own betrayal by the base's workers, commits to the Trisolaran cause. She becomes the founding figure of the Earth-Trisolaris Organization.

Decades of quiet growth: The ETO operates as a shadow network. Its two wings—the Admirers, who sabotage human science to ensure helplessness at the Trisolarans' arrival, and the Redeemers, who seek to preserve and transmit Trisolaran knowledge—recruit through the 'Three-Body' game, a direct simulation of Trisolaran reality that surfaces online around 2007. Liu Cixin compresses this entire period into backstory, revealed through fragments, intercepted data, and the game's shifting rules. The reader learns the ETO's history piecemeal, mirroring how the characters discover it.

2007–2010s: The modern crisis unfolds. The game's appearance triggers the scientific community's alarm. The ETO's sabotage of the Particle Accelerator project is exposed. Ye Wenjie is identified and dies. The ETO fractures further; the Admirers are dismantled by state security. Luo Ji, a tenured-out physicist, is drawn into the strategic response.

22nd century onward: The Trisolaran fleet, en route for roughly 450 years, approaches. The dark-forest theory and the strategic deterrence of Luo Ji reshape the fate of both civilizations. Liu Cixin skips vast stretches of this era, leaping to the 22nd-century confrontation and then, in Death's End, to the heat-death of the universe, collapsing 200,000+ years of cosmic consequence into a single philosophical gesture. The ETO's founding, a single woman's act of grief, is the first domino in a chain that outlasts the stars themselves.

Did You Know?

• The Red Coast Base was modeled on real Chinese radio-astronomy projects of the 1960s–70s, and its isolation in the Gobi desert mirrors the secrecy of Cold War-era listening posts.
• The 'Three-Body' game's impossible, ever-shifting physics—where the laws of nature literally change from one 'era' to the next—is a direct in-universe transmission of Trisolaran reality, not a human invention.
• The ETO's two factions, the Admirers and the Redeemers, reflect a genuine theological split: one wing sees the Trisolarans as a divine judgment, the other as a divine salvation, and both reject humanity's right to self-d
• Ye Wenjie's decision to contact the Trisolarans is framed not as villainy but as a rational response to a specific, documented history of political violence in China, making the ETO's founding as much a political act as