"...the text is...inviting, with exercises that have real-world application, such as exploring the energy of photons that cause sunburn." Stuart J. Goldman, Sky & Telescope
"Delightfully throrough yet easy to read." American Scientist
This book provides an accessible introduction to astronomy and general relativity, aiming to explain the Universe, not just to describe it. Written by an expert in relativity who is known for his clearly-written advanced textbooks, the treatment uses only high-school level mathematics, supplemented by optional computer programs, to explain the laws of physics governing gravity from Galileo and Newton to Einstein. It is suitable for use as a university textbook for introductory physics and astronomy courses. More casual readers can skip the mathematical sections and still follow the development.