Final answer:
Not all massive stars conclude their life cycles as Type I supernovae. Type Ia supernovae occur when a white dwarf accretes enough material from a companion star to exceed the Chandrasekhar limit and then collapses and explodes. However, type II supernovae occur when the core of a massive star collapses.
Step-by-step explanation:
Not all massive stars conclude their life cycles as Type I supernovae. Type Ia supernovae occur when a white dwarf accretes enough material from a companion star to exceed the Chandrasekhar limit and then collapses and explodes. However, observational evidence indicates that SN 1006, Tycho's Supernova, and Kepler's Supernova were all type Ia supernovae. On the other hand, type II supernovae occur when the core of a massive star collapses. These supernovae are about 5 times less luminous than type Ia supernovae and are only seen in galaxies with recent, massive star formation.