I rate this a 2 out of 5 because i didn't really like this book. This book is really complicated and talks about the far future where instead of flying to different countries we are traveling through space to different planets. The concept of this story is really interesting but its really complicated. It has a lot of talking and really little action. But it is really amazing because the book was written in 1951 when the technology wasn't that advance. The author Issac Asimov was able to imagine about such complex things and write about it. Such as traveling through space and special nuclear battleships and other technology.