What is the MOST important use of Cepheid variables for astronomers?
A) The distance to a Cepheid variable can be found very easily.
B) The characteristics of the pulsation of a Cepheid variable can be used to investigate conditions in the core of the star.
C) The diameter of a Cepheid variable can be found very easily.
D) The metal content of a Cepheid variable can be found very easily.
Correct Answer:
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