The so-called “Great Debate” at the National Space Society’s (NSS) International Space and Development Conference (ISDC) in Chicago on Saturday afternoon featuring Mars Society founder Robert Zubrin and former Apollo astronaut Rusty Schweickart was something of a dud, in part because it wasn’t that much of a debate: after ten-minute opening statements by Zubrin (who opposes the agency’s proposed plans) and Schweickart (who supports them), the floor was turned over to the audience, some of whom asked questions of the two, and others who simply expressed their opinions. Conference organizers explained that the event wasn’t intended to be a debate...