well, as per topic tittle this is my oppinion.

human being liivng in space in conditions similar to Earth.

the only thing i can see is building space colonies such as in the gundams and macross series.

sunlight s via the sun only that the rotation and climate is man made.

it is theoratically possible for a human to life in outerspace. but the logistic involving to send 1 person and keeping that person alive is huge.

so imagine if we were to send 5000 people to live in a space colony. the cost would be(pardon the pun) astronomical.

but only in the early stages. once we have mastered the science of space colonization then the cost would be reduce as more and more people will want to go there either by default or on their own will.

so space colonies are ethe way to go for mankind. once space colonies are up and running, we can make the colonies go to where ever we want .

Mars, Jupiter or like in the anime series ask the colonies to search for new habitable planets. but colonization of space is the first step rather then colonizing Mars.