One reason that Cepheid stars are important to astronomers is that
A) They are especially rich in metal content
B) There is a definite relationship between variability period and luminosity
C) They are all in the plane of the galaxy-so center can be measured
D) They can be seen even in distant clusters of galaxies
E) They are very young,so stellar evolution can be studied in detail
Correct Answer:
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Q20: The most important factor affecting a star's
Q21: The sequence of reactions by which stars
Q22: What is the triple alpha process?
A)A fraternity
Q23: What happens when electrons become degenerate?
A)Their pressure
Q24: Which of the following is a key
Q26: Elements heavier than iron are produced
A)In stars
Q27: What prevents stars of 4 solar masses
Q28: What causes Cepheid variables to vary in
Q29: What would happen if asymptotic giant branch
Q30: What element is produced by the triple-alpha
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