What fraction of the material returned to the interstellar medium of a galaxy by stars is contributed by planetary nebulae as they eject their shells?
A) about 15%
B) only about 1 part in a million
C) less than about 1%
D) about 80%, or most of the returned material
Correct Answer:
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Q24: The core of a planetary nebula has
Q25: The fraction of the mass of a
Q26: What will be the mass of the
Q27: The shell of a planetary nebula is
Q28: Out of all matter ejected into the
Q30: Which of the following important components does
Q31: What causes thermal pulses in low-mass stars?
A)Thermal
Q32: The energy to produce a thermal pulse
Q33: The object seen at the center of
Q34: According to our theories of stellar evolution,
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