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Stellar Evolution describes the life cycle of stars, from their formation in nebulae to their ultimate fate as white dwarfs, neutron stars, or black holes. It explores the physical processes that govern each stage of a star's life, such as nuclear fusion, gravitational collapse, and supernova explosions. This subcategory is closely related to Nebula, as it delves into the conditions and mechanisms necessary for stars to form within these cosmic clouds of dust and gas. It also falls under Astronomy and Science, as it employs observational data and theoretical models to understand the universe's celestial objects and phenomena.