I have recently been reading a book called The Elegant Universe. Not the newest book I know, but definitely right up my alley. It explains the new and exciting string theory that we've all been hearing about.
The thing I like about this book is the real examples of what's wrong with physics today and how string theory unifies the theories of relativity. It takes wholly mathematical concepts and illustrates them in such a way to make your average joe understand. Without a complete concept of the way space and time works, we will never be as efficient as possible in space travel and exploration.
It's a great read. If you are into cosmology and astrophysics along with astronomy, this book is definitely for you.