What about natural protection? The Moon has lava tubes, and Mars has volcanic formations and possible cave systems too. I read about these ideas years ago already as possible solutions. Would that not be one of the possible answers against radiation, micrometeorites, and extreme surface exposure, instead of only thinking about exposed structures? And what about subsurface ice or frozen water deposits, especially on Mars? Not only as a water resource, but maybe also as part of the thermal question, if used carefully. I am asking more than claiming. It seems to me the long term answer may be to use the planet or Moon itself as protection, not build everything fully exposed on the surface.