sophiecentaur said:
Any other environment in the form of a massive spaceship or a nearby planet would need more work than most people could imagine,
I think you have said a mouthful there.
The Earth is one massive recycling unit, geological and biological..
with a major energy input from an outside source ( sun ) that we did not have to engineer, and needs no maintenance. reliability.
We can collect some of that energy directly ( solar panels ), indirectly ( hydro electric ), or from stored sources ( petroleum, coal ).
What is not "mentioned" is the energy from the sun that heats the earth, grows the vegetation, cycles the atmosphere and water,...
What is also not mentioned is that on Earth for more resources, we just dig a hole in the ground and extract.
I like the idea of a spaceship colony, it is interesting, no doubt about that. We may get there some day.
With present technology,
It lacks though a 100% proof in the pudding energy source, and an adequate supply of "cheap" resources.
How much is enough? Probability analysis - not sure I would trust a long trip ride on "chances are ... "
A planet - already 809 posts.