Posted by Crono

the problem is that you'll constantly need to create useful energy, which is the opposite of how nature works (breaking down from orderly and useful energy to chaotic and worthless energy). you can generate power etc with solar panels, sure, but will it account for everything?

matter will need to leave the system anyway, not everything is reusable. =[

the london point was a tiny example of a bigger and more important point, which is that we need to advance ourselves as a society first before we try to tackle a space city.