There is a school of thought that building a sustainable base on the moon is actually harder than Mars. Some of the reasons: * No atmosphere, no source for Ox

There is a school of thought that building a sustainable base on the moon is actually harder than Mars. Some of the reasons: * No atmosphere, no source for Oxygen and Carbon * 28 day night/day cycle, hard to keep your base power over the 14 day night * Unclear if water can be found * Lower gravity Potentially this means that way more resources would have to be brought in from the outside than on Mars. (If this is really the case remains to be seen. But the idea that the Moon is closer, therefor it's easier has to be at least challenged)