I bought this book because I admire Stephen Hawking and wanted to learn more about science. He asks questions in this book that I haven't thought of like what is in a black hole. There is no definitive answer to this question, but I did learn that a black hole is a collapsed star that does have gravitational power to suck in a human being. I learned that a black hole does trap in light and emit a lot of heat and radiation. Hawking supported living in space, and he supports his belief by telling readers there are ice caps in the craters on the moon and volcanic activity on the planet Mars. This may be old news to most people, but this is new information for me. It gives hope that people will eventually live in space and build colonies there. I really like the chapter where Hawking questions whether or not God exists. He did not believe in God, but he does asks readers what question they would ask God if they believe in his existence. This is a question that got me thinking about what I would ask. There are written tributes in this book by his daughter Lucy, actor Eddie Redmayne that all show how revered Stephen Hawking is. I admire the optimism he had and enjoy this book very much.