Galileo At Work: His Scientific Biography.

First edition of this work on Galileo. Octavo, original cloth. From the library of Stephen Hawking. Stephen Hawking was a theoretical physicist, cosmologist, and author who was director of research at the Centre for Theoretical Cosmology at the University of Cambridge at the time of his death. Hawking's scientific works included a collaboration with Roger Penrose on gravitational singularity theorems in the framework of general relativity and the theoretical prediction that black holes emit radiation, often called Hawking radiation. He was the first to set out a theory of cosmology explained by a union of the general theory of relativity and quantum mechanics. Hawking may be one of the most recognizable of theoretical physicists in part due to ALS, which gradually paralyzed him over the decades. After the loss of his speech, he was able to communicate through a speech-generating device—initially through use of a handheld switch, and eventually by using a single cheek muscle.  He is also well known since he achieved commercial success with several works of popular science in which he discussed his theories and cosmology in general. His book A Brief History of Time appeared on the Sunday Times bestseller list for a record-breaking 237 weeks. In this book, Hawking details some of the history of Galileo and most likely used this book as a reference. Very good in a very good dust jacket.