What causes Cepheid variables to vary in brightness?
A) They pulsate
B) Eclipses
C) Changes in nuclear energy generation rate
D) Obscuration by clouds of dust
Correct Answer:
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Q23: What happens when electrons become degenerate?
A)Their pressure
Q24: Which of the following is a key
Q25: One reason that Cepheid stars are important
Q26: Elements heavier than iron are produced
A)In stars
Q27: What prevents stars of 4 solar masses
Q29: What would happen if asymptotic giant branch
Q30: What element is produced by the triple-alpha
Q31: The "helium flash" is
A)The rapid consumption of
Q32: The lifetime of a star half the
Q33: What limits the formation of giant stars
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