As this book enthusiastically conveys, cosmology is an exciting, fast-moving field of study. Only two years after the original edition, fundamental breakthroughs in our understanding of the universe have dictated that a second edition of this fascinating book be produced. Entirely new chapters on the architecture of matter and the large scale structure of the universe have been inserted. Other topics now covered in depth include the mysterious gamma ray bursters and the amazing discovery that the expansion of the universe is accelerating. The chapter on the formation of galaxies has also been expanded to include the scientific revelations obtained from the study of the deepest reaches of the universe by the Hubble Space Telescope. In short, this second edition provides a thorough introduction to the cosmology of the third millennium.