Using genetic modification, it is possible to create a subspecies of the empire's primary species with a different climate preference. Only habitable planets and barren worlds with the Terraforming Candidate modifier can be terraformed.

It is also possible to terraform habitable worlds, though this is a costly and time-consuming process and requires the Terrestrial Sculpting technology to be researched. Habitability strategies Īs only about ⅓ of planets will match the primary species preferred climate category, to fully and efficiently utilize all habitable planets in their own systems, an empire may want to populate its worlds with alien species, genetically-engineered subspecies, or even robots. Planets with an anomaly or a pre-FTL species cannot be colonized. The world is currently being terraformed. The world is < 40% habitable for all species in the player's empire. The world is 40–69% habitable for at least one species in the player's empire. The world is ≥ 70% habitable for at least one species in the player's empire. Planets with the Terraforming Candidate modifier don't create planet icons unless they are being terraformed. Systems containing habitable worlds will have one or more planet icons that are either green, yellow, orange, red, or blue – depending on the habitability percentage and/or status of the planet(s) in question. Low Habitability can trigger various events.Robot pops have 200% habitability for each planet type, but empires that aren't Machine Intelligences require the Droids technology to build colony ships using robots.Homeworlds have +30% habitability for the species originating from them.It floors at 0% Habitability, giving +100% pop upkeep and amenities usage, and −50% job output and pop growth. Every 1% reduction of habitability below 100% increases pops' upkeep and amenities usage by +1% and reduces their job output and species growth by −0.5%.Tomb World, Machine World, and Hive World Ring Worlds, Gaia Worlds, and Ecumenopolises have maximum habitability for all species, while Tomb Worlds, Machine Worlds, and Hive Worlds (except for Hive-Minded species) normally have 0% habitability for biological species. The 9 regular habitable world types are divided into 3 climate categories: dry, frozen, and wet. A planet's habitability for a given species is determined by how closely its climate matches that species' preference.

Most species have a climate preference for one of the primary habitable planet types, although more exotic preferences are possible. Habitability is the measure of how comfortably a species can live on a planet.

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