okay, like how plasma is confined within the iter reactor or within the vasimr engine... and like what they showed in the film "angels and demons".
but like xenoensi said, there is no need of artificial stars, advancement in led lamps will provide full-spectrum lighting... as for electricity generation, look at my mention of "stirling engines" above and the points i wrote with that... nuclear electricity seems obsolete to me.
unless a construction is a spaceship and not a natural rock foundation, what is the point of the construction... i earlier spoke of a town within a spinning asteroid because the asteroid can be a big spaceship which can travel, and arrive near a bigger world which can be or has been terraformed, or just for exploration or mining.
i don't like the idea of "ring worlds" or "dyson spheres"... they are pointless.
places to go are found by travel... otherwise it would be like present-day space stations, be it salyut, be it iss... we have been hanging in low earth orbit for 40 years.
that anyway can be done by digging into big asteroids.
in human population, i want only the females to grow in gigantic numbers... minimal male population is essential to keep the males disciplined and focus on the natural male ability ( at least in some males ) ( is truth,
@levina ) to innovate, challenge, explore, invent... and more females means... heh heh heh
well, carl sagan is wrong... we should not deviate from living closely with nature, in a socialist/spiritual/gentle/thoughtful manner... i find cell phones unnecessary, leave alone "ring worlds".