Lesson Four : Supernova Remnants
In this blast of energy, the star returns its unused hydrogen, helium and other heavy elements such as oxygen, silicon, iron and uranium back into interstellar space. Finally, the shock wave from the explosion creates an intricate, expanding shell known as a supernova remnant which is easily seen at radio wavelengths.
Supernova remnant Cassiopeia A in Radio
NRAO / AUI
Supernova remnant Crab Nebula in radio
NRAO / AUI
The fate of the star's core again depends upon the remaining mass it contains.