As the title suggests, this book is about fundamental things that one might expect to remain fairly the same. Yet astronomy has evolved enormously over the last few years, and only a few chapters of this book have been left unmodified. Cosmology has especially changed very rapidly from speculations to an exact empirical science and this process was happening when we were working with the previous edition. Therefore it is understandable that many readers wanted us to expand the chapters on extragalactic and cosmological matters. We hope that the current edition is more in this direction. There are also many revisions and additions to the chapters on the Milky Way, galaxies, and cosmology.
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