Science fiction is filled with spacecraft. On Earth, actual rockets explode over Texas while others make their way to Mars. But what are spacecraft, and just what can they teach us about imagination, ecology, democracy, and the nature of objects? Why do certain spacecraft stand out in popular culture?If ever there were a spacecraft that could be detached from its context, sold as toys, turned into Disney rides, parodied, and flit around in everyone's head-the Millennium Falcon would be it.Spring...