What causes a star to explode, and what can supernovae teach us about the universe? This book explores the dramatic and powerful events of supernovae, the explosive deaths of stars. It discusses the different types of supernovae, the process leading to an explosion, and the crucial role supernovae play in the cosmos, such as synthesizing heavy elements and influencing galaxy formation. The narrative also examines how observations of supernovae have led to important discoveries about the universe, including the accelerated expansion of the universe and the existence of dark energy. By detailing the lifecycle of stars and the science of supernovae, the book highlights the dynamic and transformative processes that shape the observable universe.