
This book summarizes the gathering of information on and the growing understanding of M33 from the 1920s, when Hubble first determined its true nature, to the 21st century, when the Hubble Telescope probed deeply into its many secrets. With its regular symmetrical spiral structure,...

Basic Data.- Developing Knowledge.- Hubble's Pioneering Study.- Structure.- The Nucleus.- Clusters and Associations.- Gas and Dust.- Spectra and Abundances.- Stellar Populations and the Star Formation History.- Variable Stars.- X-Ray Sources.- Dynamics and Mass.- Index.