This is silly. First we should build orbiting colonies, some that can fairy between the moon, mars and eventually other planets (I believe these are often calle

This is silly. First we should build orbiting colonies, some that can fairy between the moon, mars and eventually other planets (I believe these are often called Cyclers). Solving the living condition issues in these colonies is actually easy -- they would be large rotating cylinders to provide artificial gravity (probably 1/2 g) and the outer perimeters would be water containment which is very good at blocking cosmic rays. A strong magnetic core could also provide some shielding.