NASA
Nasa: Imagine the Universe: Supernovae Remnants
A brief description of supernova remnants with many embedded links to help define terms used in the description. The specific topics are age and the importance of remnants to us and the types. Definitions of key words are provided.
NASA
Heasarc: Supernova
Describes the most energetic explosive event in outer space: the supernova. Includes animation of a supernova.