Sol System 2350

Sol only. Humanity has no FTL capability at this snapshot. The Epstein drive maxes out at ~5% of light speed exhaust velocity. No generation ships or extrasolar probes are in operation. The ring gates that later connect to 1,373 extrasolar systems do not yet exist in 2350.

Population: 35e9. Estimated per-person power: ~30,000 W (about 14x Earth 2023's 2,200 W/person). Fusion power is widespread via Epstein drives, but half of Earth's 30 billion live on Basic Assistance with modest energy footprints. Mars terraforming and Belt stations are energy-intensive.

Total power: 35e9 x 30,000 = 1.05e15 W. Kardashev: log10(1.05e15) / 10 - 0.6 = 0.90.

Min (10,000 W/person, conservative): 3.5e14 W, K = 0.85. Max (100,000 W/person, generous): 3.5e15 W, K = 0.95.

No megastructures, no stellar energy harvesting. Approaching but not reaching Type I.

Counts major inhabited worlds, moons, and stations. Planets: Earth, Mars (2). Major moons: Luna, Ganymede, Europa, Callisto, Io, Titan, Enceladus (7). Major asteroid stations: Ceres, Eros, Vesta, Pallas, Hygiea, Tycho (6). Total ~15 named major settlements. Hundreds of smaller unnamed stations and mining outposts exist throughout the Belt.

No unified Sol System government. Three competing entities share the system. The United Nations governs Earth and Luna as a federal presidential republic led by the Secretary-General. The Martian Congressional Republic is a parliamentary republic with compulsory military service, led by the Prime Minister. The Outer Planets Alliance is a decentralized movement of Belt factions, part political organization, part resistance network, not formally recognized as a sovereign entity by Earth or Mars.

Combined UNN + MCRN + OPA fleet. The UNN outnumbers the MCRN 5:1 in ships (canon, TV Season 2). The UNN operates Home Fleet, Jupiter Fleet, and Saturn Fleet with dreadnoughts, battleships, cruisers, destroyers, and corvettes. 16 Leonidas-class battleships docked at Lovell City (Luna) during the Free Navy Conflict. Munroe-class light destroyers make up the larger portion of UNN fleets.

The MCRN is smaller but fields more advanced ships. Exactly 8 Donnager-class battleships built during the Cold War. Morrigan-class patrol destroyers are mass-produced. Duarte later takes up to a third of the entire MCRN fleet to Laconia.

Estimated: MCRN ~60 ships, UNN ~300 at 5:1 ratio, OPA ~10 converted civilian vessels. Total ~350.

Earth: ~30 billion (half on Basic Assistance). Luna: ~100 million to 1 billion. Mars: ~4 billion (books). Belt and outer moons: ~50-100 million across Ceres (6M), Eros (1.5M), Ganymede, Titan, and dozens of smaller stations. Total ~35 billion, dominated by Earth's population.

TL 7 Fusion. The Epstein drive is a modified deuterium-helium-3 fusion drive with magnetic coil exhaust acceleration. Hardest technology: controlled fusion for propulsion and power generation. Railguns and PDCs are electromagnetic/kinetic weapons, not a higher tech tier. No nanotech (TL 8), no FTL (TL 9), no artificial gravity, no energy shields.

All of humanity is confined to the Sol System. Settlements span from Earth and Luna in the inner system through Mars, the asteroid belt (Ceres, Eros, Vesta, Pallas), to the Jovian moons (Ganymede, Europa, Callisto, Io), Saturnian moons (Titan, Enceladus), and the small science station on Titania (Uranus). The outermost major presence is around Saturn.

Class 7 Interplanetary. Fusion-powered system colonization with habitats on planets, moons, and asteroids. 35 billion people across ~15 major settlements. No FTL, no interstellar ambitions at this snapshot. The Expanse's own scale rates humanity as Tier II (Interplanetary Civilization). High end of Class 7 due to mature multi-faction system presence, but no interstellar push keeps it below Class 8.