Published online by Cambridge University Press: 05 June 2012
From the author to the reader
Why this book is about gravity
During the 35 years that I have done research in gravitation, I have watched with amazement and delight as my colleagues in astronomy have, step-by-step, opened up almost the entire Universe to our view. And what a view! There are punctures in space called black holes that capture gas and stars with a relentless and unbreakable grip; there are 10km balls called neutron stars that are immense overgrown atomic nuclei with more mass than our Sun, that spin about their axes hundreds of times per second while emitting intense beams of radiation; there are bursts of gamma-rays from the most remote regions of the Universe that are so intense that they outshine the rest of the Universe for a short time; and most strikingly of all there was the beginning of time itself in an explosion of pure energy, driven by a force we do not understand, in which matter as we know it did not exist, in which even the laws of Nature themselves were mutable.
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