Maintaining very small ecosystems

[snikt]
> In space there's no weather; but the amount of light blocked
> by the windows might be some concern; being above the earth's
> atmosphere helps some.
>

Also, since you can use concentrating mirrors to put as much sunlight as you
need inside your colony, I think that this window absorption problem
(supposing that it can't be overcome by using different types of transparent
materials in the windows) is no major concern.

[snikt]
> --
> - Ian Woollard (ian.woollard@...
>
> "Is a planetary surface the right place for an expanding technological
> civilization?"
> - Gerard O'Neill

Lucio Coelho