Event Description
After Operation Guzheng successfully captured communication records from the Judgment Day, humanity gained its first systematic understanding of the Trisolaran civilization and their invasion plans. Intelligence revealed that the Trisolaran civilization originated from the Alpha Centauri system, where the chaotic motion of three stars created an extremely hostile environment, driving them to invade Earth for stable living space. A Trisolaran fleet comprising over a thousand stellar-class warships had already departed, with an estimated arrival at the solar system in approximately 450 years.
Even more alarming, simultaneously with the fleet's departure, the Trisolaran civilization had modified protons into supercomputers (sophons) and dispatched them as an advance force traveling at the speed of light. The sophons had already arrived on Earth with two primary missions: first, to interfere with humanity's particle accelerator experiments, producing erroneous results in fundamental physics research and thereby locking down human technological development; second, to monitor all activity on Earth and relay intelligence in real-time to the Trisolaran fleet. Facing this dual threat, the United Nations established the Planetary Defense Council (PDC), and humanity formally entered a crisis era centered on countering the Trisolaran invasion. Fear, hope, and despair intertwined as human society underwent profound transformation.