The object seen at the center of a planetary nebula is:
A) an accretion disk around a black hole.
B) a planet in the process of forming.
C) composed almost entirely of neutrons and is spinning rapidly.
D) the former core of a red giant star, now a white dwarf star.
Correct Answer:
Verified
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A)Thermal
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Q38: When the small but dense white dwarf
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