What happens to the helium-rich core of a star after the core runs out of hydrogen?
A) It heats and expands.
B) It contracts and heats.
C) It cools and contracts.
D) It expands and cools.

Question

Quizplus · Accepted Answer

After the core runs out of hydrogen, it contracts and heats up, eventually becoming hot enough to start fusing helium into heavier elements. This process creates a new energy source that prevents the core from collapsing under its own gravity.

What Happens to the Helium-Rich Core of a Star After