Quote:
Originally Posted by vicky_molokh
[*]The rate of building up colonies. Making multiple self-sustaining colonies (not outposts) with a population ranging from at least a few millions to a billion seems like something that's hard to pull off in 200ish years. It means either focusing more on non-operatic technologies such as creation of rapid-breeding transhumans, or moving lots of people around.
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Well, the thing is 200 years is a lot of time and a lot of people can move in that time. Look at the population of North America, for instance.
If going to a colony world in your space opera is as easy as crossing the Atlantic or Pacific in the 19th century, you don't really have that much of a problem.
Quote:
Originally Posted by vicky_molokh
[*]Moving lots of people offworld implies having a large colonizing fleet. Yet somehow I doubt that a planetary population will spend more than about 0.5% of its Monthly Average Wealth Income on such a fleet and the colonization itself. Maybe 5% if there's some big long-term existential threat (because societies like being in denial). I suspect that this would be extremely little.
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If movement of people to the colonies has to be done at public expense, you likely have a problem.
If it's done by people buying their own passage from a plentiful general transportation fleet, not as much.