The "star" that is seen at the center of a planetary nebula is
A) a small, hot, and very dense white dwarf star.
B) composed almost entirely of neutrons and spinning rapidly.
C) the accretion disk around a black hole.
D) a planet in the process of formation.
Correct Answer:
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Q37: The diameter of a typical planetary nebula,
Q38: The two longest stages in the lifetime
Q39: A planetary nebula is
A) a shell of
Q40: A planetary nebula is a
A) gas shell,
Q41: What are "thermal pulses"?
A) These are the
Q43: How is it that white dwarfs, which
Q44: The final remnant of the evolution of
Q45: The interiors of white dwarf stars are
Q46: Stars that have ejected a planetary nebula
Q47: A white dwarf star is about the
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