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Slarkon

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The Founder

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You can only terraform Barren Planets that are marked as "Terraforming Candidate" (Mars is always one of those).
And you need the 3rd Terraforming Tech (Atmosphere Restoraution/Tomb world recovery) to do so.

Generally terraformable are only colonise planets.
 

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oh so weird they have a terraform button one the barrens if you cant terraform it.
please tell me there is a way to find them or do i just just jump though every system i own one by one clicking on every single planet ?
 

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That the button appears on all barrens and the less then telling Tooltip sound like bugs.

I know habitable planets should appear in the expansion Planer.
I do not know if Terraforming Candidates are included. Overall this feature is rather new.
And once terraforming is started, they appear in the Outliner.