Question

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.

Explanation:

Answer:

1. The hydrogen supply in the core starts to run out. The outer shell expands, cools down, and starts to glow red.
2. 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.
3. Stars that have roughly more than three times the mass of our Sun become black holes.