Extreme world colonialization

if they are class 0 planets then they cannot be colonized. There would be a red Icon if the planet is colonizable. yellow if you have researched 50% (basic) and green if you did the advance reasearch.

Saturn and mercury will always be 0 and really uninhabitable if you start on terran.

Also, if you zoom back until you see the icons instead of the graphics, notice how PQ 0 worlds are just circles, while planets with higher ratings will be progressively more filled in. "Barren" worlds (or other extreme environments) work the same way, except they have a red circle, that turns yellow when you have the first level of colonization, and green when you have the full tech. These are the worlds that the tech affects.

Thanks, that's helpful, though these extreme worlds with a red/green circle appear to be really rare. At least on the maps I have been playing so far, they obviously were so rare that I did not even notice them I would certainly like it more if any world could be colonialized at some point of technological developement, just as in good old MOO2 times...

Other things to note. As remric pointed out, the first tech for a planet type will change production from 0% to 50%, the second will change it from 50% to 100%. You can still steal a planet via invasion/culture flip and not have the tech for it. It won't build a building or ships any century soon until you get it's tech, but it'll get you taxes and research.

Also, the closest to MOO's terraform techs galciv2 has is if you invade a planet with the Korath's spore ship, it'll change the planet to a Toxic world no matter what it once was, yes a Radioactive planet will now be Toxic instead. IMHO this gives the Korath a reason to not learn any of the other planet types.

There is a random event that all planet w/in a sector or two of a planet will increase by PQ(some number, often 5). This will increase a PQ0 to a PQ5 giving you TONS of planets laying about if you have the right map settings.

This is the closest it gets to changing PQ0 worlds.

On a tangential question, is the spore ship capability of the Korath supposed to change the normally extreme (other than toxic) atmosphere away and change it to toxic only? This seems counter-intuitive to me. If it is an aquatic world and you "spore" it, it seems to me that it would still be aquatic??

It should be a hybrid of the two IMHO. It should be toxic water covered planet.

Barring THAT fun of hybrid extreme world types, it just terraforms any planet type into a Toxic planet type.

I may be wrong, but I believe that the planets that I conquered (usually through influence) while I didn't not have the tech seemed to produce at 100%.
Which led me to NOT research any of those techs and simply leave the AI grab it then conquer it afterwards .

I have been known for hallucinations, maybe I never even played galciv2 and simply imagined it .

Social and military rating are affected, but you can research all you want even without the necessary colonization techs. Social/military points from focus is are also not effected, IIRC.

I tested with Korath spore ships and my production was 1 (both military and social).
I guess I had other bonuses that came from different sources that weren't affected by the world type.
My bad.