Astronomy is the natural science that involves the observation and explanation of various events occurring outside Earth and its atmosphere. It applies chemistry, mathematics and physics to study the origin, phenomena and evolution of celestial bodies. The celestial objects studied under this discipline include nebulae, planets, stars, moons, galaxies and comets. It also studies phenomena like quasars, cosmic microwave background radiation, supernova, pulsars and gamma-ray bursts. Astronomy can be further classified into solar astronomy, astrophysics, stellar astronomy, astrochemistry, galactic astronomy, astrobiology and cosmology. This book attempts to understand the multiple branches that fall under the discipline of astronomy and how such concepts have practical applications. It strives to provide a fair idea about this field and to help develop a better understanding of the latest advances within this area of study. Scientists and students actively engaged in this field will find it full of crucial and unexplored concepts.