Stage I

Subclasses of habitable worlds

Boundless Ocean

Class: Ocean World

Type: normal

The world is completely covered with water, without a single piece of land.

Fog World

Class: Tropical World

Type: normal

Wet, swampy world with permanent thick fogs.

Swamp World

Class: Tropical World

Type: normal

The world of murky swamps, steaming bayous, and petrified forests.

Karstic World

Class: Arid World

Type: normal

The arid world entirely covered with scars of huge karst crevices.

Glacial World

Class: Arctic World

Type: extremal

The planet is completely bound by vast glaciers.

Dune World

Class: Desert World

Type: extremal

The world is covered with endless sandy sea of dunes and frequent sandstorms.

Boreal World

Class: Continental World

Type: normal

Postglacial world with a strong predominance of coniferous forests.

Underground World

Class: Desert World

Type: extremal

The scorched world whose biosphere is preserved only in vast caves.

Young World

Class: Savannah World

Type: extremal

Primordial world with strong volcanic activity.

Tempest World

Class: Alpine World

Type: extremal

Cold, rocky world with constantly raging hurricanes and storms.

Geothermal World

Class: Tundra World

Type: normal

Cold wastelands with extensive foci of geothermal activity.


Class: Continental World

Type: normal

Most of the continents of the planet are covered with forests of giant trees.

Exotic World

Class: Tropical World

Type: normal

The biosphere of the planet is very unusual and has a tendency to gigantism.


Subclasses of uninhabitable worlds

Sulfur World

Class: Molten World

A geologically active planet whose surface is predominantly covered with sulfur and sulfur dioxide.

Greenhouse World

Class: Toxic World

A world with a very dense atmosphere, consisting mainly of carbon dioxide, and a high surface temperature due to the greenhouse effect.

Methane World

Class: Toxic World

The atmosphere of this gloomy world consists of nitrogen and methane-ethane compounds, which very often precipitate on the surface, forming vast lakes.


Class: Asteroid

This is a minor or dwarf planet having enough mass to form a shape close to spherical under the influence of gravity.

Ice Planetoid

Class: Ice Asteroid

This small or dwarf planet consists primarily of frozen H2O.

Frozen Ocean

Class: Frozen World

Cold world covered with a thick crust of ice, under which there may be water in a liquid state or viscous convection ice.

Hot Giant

Class: Gas Giant

Gas giant mit very short orbital period. The close proximity to their stars and high surface-atmosphere temperatures resulted in the moniker “hot Jupiters”.

Gas Supergiant

Class: Gas Giant

Gas giants with a large radius and very low density are sometimes called “puffy planets” or “hot Saturns”.

Ice Giant

Class: Gas Giant

This type of gas planets consist mostly of solid aggregate states of water, ammonia, methane and hydrogen sulfide, as well as rock, which make up approximately one quarter of the mass.

Scorched World

Class: Barren World

This planet is too close to the central star of the system, it’s unbearable heat on its surface and terrible cold at night.