Space science refers to the study of space exploration. It includes the fields like astronomy, astrophysics, planetary science, physical cosmology, etc. Astronomy, being a part of space science, is concerned with the study of the evolution and origin of celestial bodies like comets, gamma ray bursts, stars, galaxies, planets, cosmic microwave background radiation, moons, etc. Different approaches, evaluations, methodologies and advanced studies on astronomy and space science have been included in this book. It presents researches and studies performed by experts across the globe. The book will help the readers in keeping pace with the rapid changes in this field.