This book tells the story of the Mt Stromlo Observatory in Canberra which began with W.G. Duffield's idealism and vision in 1905. The Observatory began life as a government department, later becoming an optical munitions factory producing gun sights and telescopes during the Second World War, before changing its focus to astrophysics – the new astronomy. In the ensuing years programs were introduced to push the Observatory in new directions at the international frontiers of astronomy. The astronomers built new, better and larger telescopes to unravel the secrets of the universe. There were controversies, exciting new discoveries and new explanations of phenomena that had been discovered. The Observatory and its researchers have contributed to determining how old the universe is, participated in the largest survey of galaxies in the universe, and helped to show us that the universal expansion is accelerating – research that led to Brian Schmidt and his international team being awarded the 2011 Nobel Prize in Physics. These and other major discoveries are detailed in this fascinating book about one of the great observatories in the world.