colonizing mars should be on the top of the to - do list. however, it would inflict health issues on the inhabitants. radiation is one of the main issues, but it is too cold and infertile to grow plants on the surface. also mars dust is really fine and the spacesuits are almost impossible to clean so they would probably have to dock on the outside of the base. but if we could warm mars up a little, we could grow some potted plants. earth plants inhale C02 and exhale oxygen.this could be a major step in terraforming mars. if there was more oxygen, an atmosphere could form, warming the planet, causing the ice caps to melt, finishing the process.