These all seem like very sensible wins -- especially #6.<p>I think #5 is the most interesting, but my immediate first question, as a total layman for space travel&#x2F;survival, is how do we keep breathing up there? It seems like solving the O2 to Moon transport is a reasonable problem to tackle -- assuming we get people and gear up there -- albeit a lot of effort. How about the next outpost? And then the next? Do we continue bunny hopping O2 transports from Moon to Mars to Earth2... etc until there is a continuous supply of breathable air out from Earth? Or do we have a way to generate as we go further? Are we at mercy of Earth&#x27;s O2 supply? That seems like the biggest problem for leaving this planet.