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A large object which does not produce its own energy and orbits a star (except for rogue planets). The difference between a planet, a planetoid, an asteroid and a snow ball is sometimes vague.

See world types for further definitions. A list of known planets is available at the category Planets.

Size classification

  1. Planetoid (Moonlet if in orbit of another planet)
  2. Dwarf planet (Moon if in orbit of another planet)
  3. Planet
  4. Gas giant
  5. Gas supergiant
  6. Gas ultragiant
  7. Brown dwarf

Planetary weather

Planets with no atmospheric density have no atmosphere, and therefore won't have any weather.

Surface temperature classification

Subarctic: These are very cold temperatures, ranging from absolute zero (-273C) all the way up to about -100 C. Subarctic temps are common on outerzone worlds.

Arctic: These are cold temperatures that typically range from -100C up to the freezing point of water (0 C). Arctic temperatures are common in the outer ecosphere lanes, but can be experienced anywhere in the ecosphere or post-ecosphere.

Temperate: These are generally mild temperatures favored by most lifeforms. These temperatures usually range from zero degrees C up to room temperature, around 25 C. Temperate temperatures are common throughout a planet's ecosphere.

Tropical: These are usually warmer but still tolerable temperatures. The typical temperature range for this category is from 25C up to around 50C. Tropical temps are common in the inner ecosphere lanes, but can be experienced anywhere in the ecosphere. Tropical temperatures may sometimes be found in the second pre-ecosphere lane.

Searing: Searing temperatures are usually too hot to support most lifeforms but still below the boiling point of water, between 50C and 100C. Searing temperatures are common in the innerzone, though occasionally they may be seen within a system's ecosphere.

Inferno: These are extremely hot temperatures greater than the boiling point of water 100C all the way up to around 2000 C (though technically there is no upper bound to this category). Inferno temperatures are common in the pre-ecosphere, particularly in the first pre-ecosphere lane and within the radius of a star's R limit. Particularly high Inferno temperatures may pose a significant thermal damage hazard to space vehicles and starships.