As a main-sequence star exhausts hydrogen in its core, it next becomes
A) a protostar.
B) a red giant star.
C) a white dwarf star.

Name: As a main-sequence star exhausts hydrogen in its core, it next becomes A) a protostar. B) a red giant star. C) a white dwarf star.
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As a main-sequence star exhausts hydrogen in its core, it will start to contract, increasing its temperature and causing the outer layers to expand. This expansion will turn the star into a red giant star.

As a Main-Sequence Star Exhausts Hydrogen in Its Core, It