To conclude any opinion on a technical matter, it is necessary to review the economical and ethical feasibility of the specific project. It is therefore required to take the recent efforts and developments in manned space flight into account, and to ask what the general aim of ongoing missions will be. If the essential product of general space aviation is to be the human colonization of space, then one may see the production factors as being medical or biological information of organisms in the space environment, astronomical and geological information, technological information on transportation equipment and human experience in space aviation. While our earth increasingly sees environmental damage due to industrial rape of raw materials as well as biological and geological mismanagement of properties, it increasingly becomes necessary for humankind to seek other environments that can offer further human development. This is a very strong ethical argument that secures future generations of mankind the ability to multiply and intellectually develop in the typical principle of evolution. Therefore the primary longterm objective of space aviation has to be the colonization of space. Colonization of space requires manned transport modules that fly to colonies which are either of satellite nature or built upon the surfaces of natural geological bodies in space. Since the argumentation is primarily of ethical nature regarding the essentials of future generations, further questions regarding cost and risk become almost invariable, unless the technologies involved are not developed well enough and mean that the use thereof will certainly be hazardous to the people involved. In these cases robotics and unmanned missions must assist in development of safe solutions. Robotics in unmanned missions should also be utilized in the case of simple reconnaissance missions in preparation of manned missions.