The most technically feasible ways to make travel around the solar system routine and fast and then to build a foundation for interstellar flight is to build large and light space structures. It will be easier to build bigger in the low gravity of space. We need robots and new construction systems. All of our Earth-based megastructures will look tiny in comparison to the space-based structures. Fully reusable rockets are the game changer that SpaceX is creating now. The next steps are robotic construction capabilities and megawatt and gigawatt power. No matter what the large power source is we have to build large in space to radiate the heat from the large power systems.

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