I really liked the clever way the author explained stuff in this book but I already understood most of it. Neil himself states in the book that if you are not in a hurry and want to know more about the topic the are plenty of bigger books you can look into. So my question is: what is sort of a next step after this book on this topic (astronomy, astrophysics)? Thanks.
I liked Black holes & time warps by Kip Thorne. Here's the link. While being easy to understand, he does go into some details regarding black holes and the warping of time, which I think are interesting to the casual reader. If you have a science degree, you might not learn much new informations, but it's a good read.