Stellar explosion, also known as a supernova, is a powerful and catastrophic event in which a star suddenly increases greatly in brightness before fading away. This phenomenon occurs when a star reaches the end of its life cycle and either collapses under its own gravity or undergoes a thermonuclear explosion. Supernovae play a crucial role in the evolution of the universe by producing and dispersing elements necessary for life, as well as emitting vast amounts of energy and radiation. Scientists study stellar explosions to gain insights into the process of stellar evolution, the behavior of matter under extreme conditions, and the formation of new stars and galaxies.