Terraforming
Concept · Exploration · Stellaris 4.5.2
Terraforming (exploration) in the Stellaris encyclopedia: Terraforming is the process of transforming an Planet within the borders of an Empire into something more habitable.
Terraforming in the game's words
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Terraforming is the process of transforming an 
Planet within the borders of an Empire into something more habitable.
This typically requires specific Technologies and a significant investment of 
Energy Credits.
With advanced Technologies, even inhabited planets can be terraformed to better suit the preferred climates of the Species living there.
Entries that mention Terraforming
More in Exploration
Source: common/game_concepts (concept_terraforming) and localisation/english, Stellaris Cygnus v4.5.2 (9776).