In order to have a thriving population in Stellaris, they'll need to live on planets that serve their needs! A race that hails from a desert planet isn't going to be able to live very well on a tropical planet, right? That's where Terraforming comes in.
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Terraforming is the process of using gases to give a planet a brand-new environment. In Stellaris, it can be used to increase a World's Habitability. This article will cover everything you need to know about it, including how to unlock the mechanic, how to use it once you do, which planets can be Terraformed, and more.
There are several Social Technologies you'll need to research for Terraforming planets. One of them unlocks the basic ability, and the others expand on your options. If you want to Terraform as quickly as possible, focus on producing Social Research over Engineering and Physics Research. There are also bonus tools you can unlock to allow you to Terraform unique planets.
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Once you've unlocked, at the very least, the Terrestrial Sculpting Technology, you can begin to Terraform your first planets!
Click on a planet that is...
...and look for the option marked 'Terraform.' From there, you'll choose the type of World you'd like to have, and the game will tell you how much the process will cost and how long it will take. The percentage listed is the planet's habitability for the race that makes up your empire. If there are multiple races in your empire, the percentage will indicate the habitability for whichever race is most suited for that environment.
The first time that you terraform any planet, there is a small chance that the planet will be affected by a Terraforming Event.
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