I couldn't rate this book in terms of stars because I am basically judging it by two sets of standards--those of 1955 when it was first was first published, and by contemporary standards. For a book written in 1955, it is quite good. Much of the social commentary holds true today, even. However, the sexist attitudes, the chain smoking (even aboard a spaceship!), the idea of people living underground on Neptune or Uranus (mentioned in passing, but still laughable) as well as an old fashioned writing style combine to mark it as the old book that it is. I still enjoyed it though, since I have a taste (tolerance?) for classic science fiction.