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What happens to the core of a star after a planetary nebula occurs

User Sid Mehta
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Answer:

Step-by-step explanation:

For low-mass stars (left hand side), after the helium has fused into carbon, the core collapses again. As the core collapses, the outer layers of the star are expelled. A planetary nebula is formed by the outer layers. The core remains as a white dwarf and eventually cools to become a black dwarf.

User Knt
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