Arrange these phases in the partial life cycle of a star in order, starting with the earliest event.
In heavy stars, the core contracts, pulling the outer
layer inward. Hydrogen fusion begins in the outer
shell. The outer shell expands, and the light
generated increases.
The hydrogen supply in the core starts to run out.
The outer shell expands, cools down, and starts
to glow red.
Stars that have roughly more than three times the
mass of our Sun become black holes.