Physics and Astronomy shows how in modern astronomy the ideas of physics are used in the detection of radiation, and in explaining the content and structure of the universe. Throughout the book, the process approach, which is a central theme of the Dimensions of Science Series, is explored and developed. This particular book will be especially useful to 'A' level physicists and undergraduates taking astrophysics as a first year option. The text is up-to-date and many ideas are discussed that are close to the frontiers of knowledge in modern astronomy.