An articulate and forceful cosmologist has produced an extraordinarily good introductory but not over-simplified book surveying the debate between the proponents of the expanding universe and those supporting the steady-state theory. Judging from the succinctly put arguments, it seems that the upholders of the latter point of view will soon be not-so-quietly folding their tents and stealing away. The excitement in this spacious corner of science is very evident in Dr. Bonnor's perspective, for he is sure that we are upon the threshold of evidence that will decide which of the numerous models of our Universe that have been described by physicists and astronomers over the years--from Einstein to Hoyle--comes closest to observational reality. And of course he favors one model, though he presents the cases for and against each in as fair and easy to comprehend (with diagrams) fashion as can be found anywhere. He uses strong and clear scientific exposition that fulfills the objective ""...to give an educated person a broad account of cosmology without worrying him with technical details"". For all collections seeking to remain up to date in this field.