Space Structures

Space Stations

A broad category of crewed or automated habitats that remain in a fixed orbit or position.

Orbital Research Stations: Small-to-medium platforms dedicated to zero-gravity science, astronomy, or materials processing. Typically have modular labs, external instrument mounts, and limited life support for 10–100 people.
Example: A microgravity pharmaceutical factory.
Military Fortresses / Battle Stations: Heavily armoured, heavily armed installations designed to control a strategic orbit, jump point, or planetary approach. They carry capital-grade weapons, point-defence grids, and fighter hangars. Unlike ships, they cannot retreat, but they can mount far more armour and power for their size.
Weakness: Immobility makes them vulnerable to sustained siege or kinetic bombardment.
Commercial Docks / Orbital Shipyards: Massive structures with dry docks, refuelling arms, cargo warehouses, and crew quarters. They service, repair, and construct starships. Often shaped like rings, spokes, or lattice frames.
Key feature: Zero-G construction bays and external scaffolding for hull assembly.
Civilian Habitats / O’Neill Cylinders: Large rotating stations that simulate gravity via centrifugal force. They contain entire ecosystems, cities, and farmland. Designed for long-term colonization without a planetary surface.
Size: Can house millions. Often located at Lagrange points.
Waystations / Refuelling Depots: Small, automated or minimally crewed stations at remote locations (e.g., asteroid belts, deep space routes). They store hydrogen fuel, oxygen, water, and emergency supplies. Often equipped with a single docking arm and a beacon.
Deep Space Relay Stations: A hybrid of a communications tower and a sensor post. They boost FTL comm signals, monitor for unauthorized ship movements, and act as navigation beacons. Usually unmanned and hardened against radiation.

Space Portals

These are fixed structures that enable faster-than-light travel, teleportation, or wormhole transit. Unlike ship-mounted FTL drives, portals are static and often require immense energy to maintain.

Jump Gates (or Star Gates): Large ring-shaped structures that generate a stable wormhole or compressed-space corridor between two fixed points. Ships fly through the ring and emerge instantly at another gate (or a natural exit point).
Requirements: A gate at both ends (except for one-way relays). Power is drawn from a star or fusion reactors.
Slipgates / Phase Portals: A variation that rips a temporary rift into subspace or an alternate dimension. The gate remains in place, but the rift closes after each ship passes. Often used in systems with dangerous natural wormholes.
Wormhole Anchors: A set of stabilizer towers built around a naturally occurring, unstable wormhole. The anchors prevent collapse, regulate transit, and prevent tidal forces from destroying ships. Without them, the wormhole is unusable.
Appearance: Spires or rings surrounding a shimmering void.
Portal Platforms: Not a portal itself, but a defensive / traffic-control structure built around a natural portal. Equipped with tractor beams, customs inspection bays, and weapons to prevent unauthorized entry. Essentially a "toll booth" for inter-dimensional travel.

Other Non-Moving Space Structures

These do not move (or move only via orbital mechanics) and are not typically classified as stations or portals.

Orbital Elevator Anchors (Tether Foot)

The stationary terminal at geostationary orbit of a space elevator. It holds the elevator cable under tension, transfers cargo from climbers to orbital tugs, and maintains the counterweight. Not a station per se; it's more of a mechanical anchor point.

Lagrange Point Settlements

Clusters of habitats, factories, and solar power collectors located at L4 or L5 (stable Lagrange points). They drift relative to Earth and Moon but are fixed in the rotating frame. Often treated as sovereign territories.

Defense Platforms / Orbital Weapon Silos

Unmanned, hardened pods carrying a single heavy weapon (e.g., a coilgun, laser battery, or missile rack). They are networked together to form a defensive grid. It dosn't need crew or engines, it only need a gun, a reactor, and a targeting computer.

Sensor Arrays / Telescope Clusters

Long-baseline interferometers spread across several kilometers of trusses. Fixed to point at a specific region of sky or a specific enemy fleet approach. Often hidden inside asteroids.

Graveyards / Derelict Fields

Not "built" intentionally, but any static collection of abandoned ships, wreckage, or debris that has been anchored or has fallen into a stable orbit. Sometimes salvagers build temporary shacks onto the carcasses, creating a stationary shantytown.

Deep Space Beacons

The smallest non-moving structure: a simple radio or laser beacon with a solar panel and a battery. It broadcasts a navigation ID, hazard warning, or "refuel for sale" message. No moving parts. Often anchored to a small asteroid.

Planetary Rings (Artificial)

Megastructures that encircle an entire planet (e.g., a Halo ring or a Niven-style ringworld segment). These are fixed relative to the planet’s gravity and rotate for artificial gravity. Enormously rare.

Star-Lifting Platforms

A theoretical structure orbiting so close to a star that it must constantly fire engines to avoid falling in. However, if placed at a Lagrange point of a star–planet pair, it can remain stationary. Used to extract stellar material.

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