I personally don't have the hard cover edition but I have the paper back edition. I plan to purchase the hard cover edition when I have the money for it. I can expand a little on the subject matter of the paperback edition, which I'm sure is simply a stripped down version of the hard cover book. It covers the history of astronomy to the latest theories in the field. Such topics as gravity, planets, the Sun, stars, thermo-nuclear fusion, black holes and quasars are explained in a easy to digest manner. I found the topic of how thermo-nuclear fusion especially facinating as I always wondered how stars (like our sun) generated it's energy, I knew it was fusion but did not understand how it functioned, all was made clear to me.

There are also plenty of visual aides and pictures in book. A large majority of images are directly from Hubble Space Telescope that will leave you breathless at the beauty and vastness of space. The book also directs you to websites that will expand on the material covered in the book. Great stuff!

Fraknoi, Morrison and Wolff have done a tremendous job in writing this book. Kudos to the authors for taking to the time to do it right.