What happens when a main-sequence star exhausts its core hydrogen fuel supply?
A)The entire star shrinks in size.
B)The core shrinks while the rest of the star expands.
C)The core immediately begins to fuse its helium into carbon.
D)The star becomes a neutron star.

Question

Quizplus · Accepted Answer

When a main-sequence star exhausts its core hydrogen fuel supply, the core begins to shrink due to the lack of energy production, causing the outer layers of the star to expand. This expansion can increase the star's luminosity and causes it to become a red giant.

What Happens When a Main-Sequence Star Exhausts Its Core Hydrogen