Stellar Evolution Type Ia Supernovae Cosmology Red Supergiants Star Lifecycle Stellar Lifecycle Mass Loss Stellar Explosions Stellar Death Distance Measurement Observational Evidence Nebulae Type Ia Supernova Transient Events Kilonova Celestial Events Energy Release Type IIb Supernovae Catastrophic Stellar Events Supernova Candidates Type 1a Supernovae Supernova H0pe