Yesterday, Metzger outlined the rationale for establishing a base in the first place, while today he focuses on the cost. UT: Your 2012 paper specifically talks about how much development is needed on the Moon to make the industry “self-sustaining and expanding”, but left out the cost of getting the technology ready and of their ongoing operation. Why did you leave this assessment until later? How can we get a complete picture of the costs? PM: As we stated at the start of the paper, our analysis was very crude and was intended only to garner interest in the topic...