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Feature Articles: Exploding Stars, Neutrinos, and Nucleosynthesis

Supernovae are some of the most violent, energetic events that occur in the universe. The most recent known supernova in our galaxy was Cassiopeia A, which occurred about 1680. This supernova was the explosion that ended the life of a massive star, also called a core collapse supernovae. Observationally, supernovae are divided into two main types, Type I and II, where the classification is based on their spectral features. Type I supernovae do not have hydrogen lines in their spectra whereas Type II supernovae do. Type II supernovae are always core collapse supernovae, but only some of Type I supernovae are.