An astronomer has been observing two Cepheid variable stars over the course of a month. Both variable stars have the exact same period of pulsation. Star A is twice as bright as Star B. Which of the following statements most accurately reflects the relationship between the astronomer (on Earth) and both Cepheid variable stars?
A. Stars A and B have the same luminosity, but Star B is closer to Earth than Star A.
B. Stars A and B have the same luminosity, but Star A is closer to Earth than Star B.
C. Stars A and B are both the same distance from Earth, but the luminosity of Star A is greater than Star B.
Answer: B
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