Supernova explosions are not only important to the ecology of the universe, seeding it, among other things, with the heavy elements necessary for the existence of life, but they are also a natural laboratory in which a host of unique physical phenomena occur. While still far from a complete understanding, scientists have made great advances during the last twenty-five years in understanding the nature and conse- quences of supernovae. This book presents the state of supernova studies at the beginning of the 1990's, as reported at a two-week meeting on the Santa Cruz campus of the University...