(a(i))[3]
State the name of the nuclear reaction that takes place at the star's centre and describe how this nuclear reaction operates.
(a(ii))[3]
Explain how this nuclear reaction helps to keep the star stable.
(b(i))[1]
As a massive star nears the end of its life, it ceases to be stable and changes into a red supergiant. State why the nuclear reaction can no longer keep the star stable.
(b(ii))[3]
Describe what happens next to the red supergiant.