Here we briefly review some of aspects of massive star death. The outcomes can
be crudely associated with three parameters - the star’s mass, metallicity, and rotation
rate. In the simplest case of no rotation and no mass loss, one can delineate
five outcomes and assign approximatemass ranges (in some cases very approximate
mass ranges) for each. These masses then become the section heads for the first part
of this chapter. 1) From 8 to 30 M⊙ on the main sequence (presupernova helium
core masses up to 12 M⊙), stars mostly produce iron cores that collapse to neutron
stars leading to explosions that make most of today’s observable supernovae and heavy elements