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[MattII]

Well I've had a look at population thing and come to the conclusion that you can pick three (and scrap one) of:
- Planet Population (how many people it's realistic for a planet to have to be properly industrial)
- Ship Population (how many people a ship could realistically carry)
- Time Scale (how long it would take, realistically, for a fresh colony to become properly industrial)
- Reproduction (how fast a colony could realistically grow)

Space Empires scrapped Ship Population, from the brief description klausD gave MOO2 seems to have scrapped either Planet Population or Reproduction.