This is a book about space settlement, but it’s a very different book about space settlement than usual. The Weinersmiths go into the State of the Art on human factors (physiology, reproduction, sanity), possible locations, technology (closed loop life support, “how to actually build a space habitat”), and the insanely complex topic of space law to come to the conclusion that “mayyyybe not right now, a lot of further studies needed”. Which is admittedly not what One wants to hear, but still sadly is what it is, and the authors make a good case for why we’re Just Not There Yet, any maybe never will.