From what I have read and seen you need to get specific technologies that allow this. The one I can think of off the top of my head is Sunlight Redirection. I assume from there it is just something you build in the planetary queue.
yep, that's what the manual says: once you have researched techs that allow you to terraform, you can increase the terraforming value in the planetary view. Once you have terraformed a planet you will have to pay a constant maintenance to keep the plante at the current terraforming-level. otherwise it will slide back.
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