When a massive star begins to run out of hydrogen to fuse, its outer layers of gas ____________.
A) expand and cool
B) contract and heat
C) expand and heat
D) contract and cool

Name: When a massive star begins to run out of hydrogen to fuse, its outer layers of gas ____________. A) expand and cool B) contract and heat C) expand and heat D) contract and cool
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When a massive star runs out of hydrogen, it starts fusing helium in its core, causing the outer layers to expand and cool, forming a red giant.

When a Massive Star Begins to Run Out of Hydrogen