Solar System

Biodata

Astronomical Profile

Development and Infrastructure

• Virtual simulation — SG Company renders a highly realistic, continually updated virtual Solar System for space-construction training and fleet exercises; the simulation recreates Space Force fleets with complete accuracy 59 76.
• Space cities — The first cylindrical space city accommodates up to 600,000 residents and uses rotation for artificial gravity. Thirty additional cities are later constructed by thirty-one engineering teams 97 98.
• Planetary industry — Industrial fleets mine resources from planets, Mars gains major national bases and planned space elevators, and Venus is later developed into a rapidly expanding industrial center 98 282.
• Dyson Cloud construction — Following the discovery of solid metallic hydrogen on Jupiter, Lin Feng begins building a Dyson Cloud from industrial fleets 98.
• Solar satellites — Dyson Cloud satellites expand from compact units into one-kilometer-wide planar structures; they maneuver on solar wind and use detachable macro-electron energy containers with independent radiation propulsion 101.
• Antimatter production — Artificial structures in solar orbit use the Sun's radiation to produce antiprotons. Twenty years after Lin Feng enters hibernation, 50,000 facilities each produce one kilogram annually, for a total output of fifty tons per year 185 206.
• Magnetic rail network — Giant electromagnetic rings extend from near Mercury's orbit to near Neptune's orbit. The system can accelerate crewed ships to 70% of light speed and could theoretically reach 95% with antimatter fuel if deceleration and protection are disregarded 206.

Political Geography

• Taylor System territory — The Taylor System controls space cities from Jupiter through Neptune, giving it influence over four of the system's eight planets. The Asteroid Belt forms its inner boundary; Mars-to-Sun territory and the Kuiper Belt are controlled by other human factions 159.
• Kuiper Belt — A civil war for the belt ends with human government control. It later becomes the location of twelve independent Fleet Worlds positioned along its outer edge 153 206.
• Earth and Mars — Both remain major population centers, but their residents fear that concentrated populations will become targets if the system turns into a battlefield 147.
• Space City Federation and Space Force — Alongside Mars, these powers establish independent gravitational-wave broadcast systems, decentralizing deterrence within the system 282.

Strategic Role

Resource Base

Lin Feng's earliest strategy treats the Solar System as a reserve of energy and raw materials to be accumulated during the four centuries before the Trisolaran Fleet's arrival. He argues that humanity's main limitation is energy rather than material scarcity, since industrial capacity can be expanded throughout the system 3 113.

The system's planets, asteroid fields, solar wind, and stellar energy support industrial fleets, transportation networks, space cities, Dyson Cloud construction, and mass antimatter production 59 98 101 206.

Battlefield and “Vladivostok”

Virtual exercises show that fighting solely within the Solar System restricts human fleet mobility and leaves it vulnerable to a technologically superior Trisolaran force. Players and Space Force personnel nickname the system “Vladivostok,” comparing it to a blockaded port where a trapped fleet cannot win 141.

Once human fleets leave the system, their extended battle lines and distributed industry allow surviving regions to continue production and stockpile resources. This logistical advantage enables the Human Fleet to surpass the Trisolaran Fleet in a simulated battle 141.

Trisolaran Objective

The Trisolaran Civilization considers trapping humanity within the Solar System its ideal outcome. If humanity remains inside, the conflict can be concluded locally; if humanity escapes into a Sophon blind spot, the war may continue indefinitely and attract dangerous Dark Forest attention 143.

Trisolaran planners further believe that, after taking the system, their fleet could gather enough antimatter from it to pursue fleeing human forces at higher speed 143.

History

Sun Ascension Plan

The Sun Ascension Plan is humanity's final means of leaving the Solar System after the confirmed Trisolaran invasion. Humans are reduced to approximately atomic-nucleus scale, conceal themselves behind space debris, and use the Sun's explosion as propulsion 286.

Lin Feng argues that detonating the Sun simultaneously provides energy collection, protection, and an organized departure sequence that contemporary microworldification technology could not achieve through a particle accelerator alone 286.

Despite resistance from Earth representatives and advocates of the Shelter and Mobile City Cluster plans, Lin Feng reaffirms the Sun's detonation. The creation of the first single-atom computer marks the beginning of the Era of Human Atomization 300.

After the explosion, atomized humans and Trisolarans travel at near-light speed and establish the Unified Collective to face the Dark Forest together 315.

Aftermath

• Sirius observation colony — Sirius is selected as the Unified Collective's first colony partly because of its proximity to the former Solar System and Trisolaran System, allowing future observation of both 317.
• Historical reference point — Later accounts describe the Solar System as having “ascended to the heavens,” while humanity's successors prepare to leave the Milky Way entirely 323.
• Earth nostalgia — Lin Feng faces continued criticism from Earth nostalgists, who blame him for Earth's destruction and the implementation of the Sun Ascension Plan 324.