The largest problem of Mars colonization is that Mars gravity is one third of earth gravity. Only adult humans will be able to visit Mars, and live there. No child born on Mars would ever be able to visit Earth, because she would be debilitated by Earth gravity.
Gravity is necessary for the maintainance of human skeletal and muscular strength.
Read about the effects of zero G on astronauts who spend a few months in space. It is not even known whether a human child raised on mars would be able to go through normal skeletal development sufficient for survival on mars. I was wondering if you had any idea of what something like this would cost. I am a student attending The Principia, and we are doing a research project on space colonization. I have the assignment of the problems or the setbacks the we will face when colonizing space.