What happens when a star like the sun exhausts its core hydrogen supply?
A) Its core contracts, but its outer layers expand and the star becomes bigger and brighter.
B) It contracts, becoming smaller and dimmer.
C) It contracts, becoming hotter and brighter.
D) It expands, becoming bigger but dimmer.
E) Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness.

Question

Quizplus · Accepted Answer

When a star like the sun exhausts its core hydrogen, the core contracts and heats up, causing the outer layers to expand and cool, making the star bigger and brighter as it becomes a red giant.

What Happens When a Star Like the Sun Exhausts Its