Finally, these habitability values can be both increased and decreased species-wide by certain traits and for a given planet by certain planetary features and planetary modifiers.Ī planet's type also affects the set of possible planetary features and blockers it may have. Each type's base habitability for a given species depends on how closely it matches a species' homeworld: in general, a species will have 80% habitability for planets of the same type, 60% habitability for planets of the same climate category, and 20% habitability for every other climate category and type. There are nine types of regular habitable planets, divided equally into three climate categories: Dry, Frozen and Wet. Habitable planets are the only natural celestial bodies that can be colonized and terraformed, without the Terraforming Candidate planet modifier. In addition, each unblocked and unused district slot will grant additional planet capacity depending on the world type (see table). This has the result that on a planet with no modifiers to housing usage, the planet capacity will equal total housing, and modifiers that affect pop housing usage will also affect planet capacity. Each unit of unused housing provides +1 planet capacity and each pop also provides +1 planet capacity. Homeworlds have a size between 18 and 21, unless otherwise determined by the empire's origin.Įach colony has a planet capacity, which determines how many pops it can support before growth starts to slow down.Planets can have various sizes, but habitable ones will always be within the following margins: The planet size determines the visual size of a planet and the maximum number of districts the planet can support if it's habitable.