"Stellar spectroscopy is the fundamental tool for investigating the natures of stars and is central to our understanding of modern astronomy and astrophysics. Revised and expanded, the second edition of this popular book provides a unique and thorough introduction to stellar spectra. It begins by looking at the concept and history of stellar classification, before introducing the reader to the formation of spectra, the fundamental properties of stars and how they can be classified. The following chapters each look at a different star type: starting with cool M, the discussion extends to cover new stellar classes L and T, before advancing to finish with O. The book concludes with a skilful integration of all the data, tracing the evolution of stars and their place in the universe. With modern digital spectra and updates from two decades of astronomical discoveries, this accessible text is invaluable for both amateur astronomers and students"--