Could a Lunar Fuel Depot Jump-Start Human Exploration of Deep Space?

In my previous post I started a conversation with spaceflight entrepreneur Charles Miller, who shared his insights about how NASA's human spaceflight program got been stuck in low-Earth orbit and how we could enter a new era of deep-space adventure. Part one of the interview focused on the role of private industry in radically lowering the cost of getting back to the Moon. But it left many topics unexplored. In particular, I wanted to hear more about the economics of what some people are