When a massive star begins to run out of hydrogen to fuse, its core ____________.
A) expands and cools
B) contracts and heats
C) expands and heats
D) contracts and cools

Name: When a massive star begins to run out of hydrogen to fuse, its core ____________. A) expands and cools B) contracts and heats C) expands and heats D) contracts and cools
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When a massive star runs out of hydrogen, the core contracts under gravity and heats up, leading to the fusion of heavier elements.

When a Massive Star Begins to Run Out of Hydrogen