If this novel face probably not among the major works of the author, it remains a good science fiction novel. Although independent of the great cycles, it could be seen as an introduction to Foundation. Moreover, as often with Asimov, a passion for astronomy found and a reflection on the future of humanity and the problems of segregation, which could be exacerbated with the continual increase of the population on Earth. In short, a good science fiction novel that reads smoothly and normally, the faithful of the author should enjoy reading.
