What exactly are extreme planets? (This is in the setup where you are choosing the universe you wish to play in. There is a sliding scale: rare, common, abundant, etc.)
How do extreme planets differ from ordinary planets?
Is the planet size different or is it the climatic conditions of the planet, requiring tech improvements in order to colonize them?
Thanks.
Extreme planets are extreme environment planets: Heavy gravity, barren, radioactive, toxic, and aquatic. You have to research technologies to be able to colonize them. (Class 0 worlds are never colonizable, apart from the rare ingame event that turns one or more of them into class ~13 worlds-the player can't do anything of the sort.)
They are harsh environments that require specific techs before you can colonize them. Each type of extreme world (e.g. Aquatic) has a level 1 and level 2 tech--you start out with a 50% production penalty until you finish the tech branch.
I have a casual impression that extreme worlds might be more likely to have a high PQ, but I'm not one of the spreadsheet builders around here. Loupindor, Sole Soul, or another of their ilk might have some firmer opions on that part of your question.
Also, some civs start out with an extreme environment tech, e.g. Torians and Aquatic worlds or Yor and Barren ones.
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