Astronomy is the field of science devoted to the study of astronomical objects, such as stars, galaxies, and nebulae. Astronomers have gathered a wealth of knowledge about the universe through hundreds of years of painstaking observations. These observations are interpreted by the use of physical and chemical laws familiar to mankind. These interpr
Introduction. Observations. Astrometry. Photometry. Gravitation and Kepler's Laws. Stars, Stellar Spectra, and Classification. Radiation from Astronomical Sources. Stellar Structure. Stellar Nuclear Reactions. Star Formation and Stellar Evolution. The Sun. The Solar System. Binary Stars. The Milky Way. Galaxies. Cosmology. Active Galaxies.