ASTROPHYSICS

THE UNIVERSE Astrophysics: Matter, Light, Gravity, and the Evolving Universe is a graduate-level companion that unites observation, theory, and quantitative reasoning into a coherent exploration of the cosmos. Spanning thirty-two chapters, the book develops its arguments from first princip principles: measurement and scale, gravitation and relativity, astronomical instrumentation, statistical inference, radiative transfer, atomic and nuclear processes, fluid dynamics and plasma physics, stellar structure and evolution, compact objects, galaxies, large-scale structure, dark matter, and modern cosmology. Every chapter combines sustained exposition with mathematical derivation, worked examples, figures with explanatory legends, exe exrcises with complete resolutions, and curated references. The result is a rigorous but readable guide for graduate students, researchers, and professionals who seek not merely a catalogue of facts, but an account of how physical claims are earned from observation, mathematics, and experiment. A universe to be observed. A cosmos to be understood. RICHARD MURDOCH MONTGOMERY, MD, PhD Richard Murdoch Montgomery, MD, PhD, is a physician, neurologist, and mathematician whose work ranges across clinical neuroscience, mathematical sciences, computing, economics, and the history and philosophy of science. He is the author of more than one hundred scientific and technical books published through the Scottish Science Society, including extended treatises on scientific and financial calculators, graduate mathematics, artificial intelligence, data science, physics, biology, medicine, and intellectual history by The Scottish Science Society. His books favour derivation, practical method, and conceptual continuity over abbreviated instruction or itemisation. A result is not merely displayed; it is earned, tested, and placed within the argument that gives it meaning. This combination of clinical experience, mathematical discipline, and long-form scholarship informs both his teaching and his writing