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What Is Responsible for the Pulsation Cycle of Cepheid Variables

Question 11

Multiple Choice

What is responsible for the pulsation cycle of Cepheid variables?


A) The rotation of the star sends flashing radio beams of light toward Earth.
B) The opacity of stellar material changes depending on the temperature.
C) The combined light of the Cepheid and an orbiting companion changes as they eclipse each other.
D) The power source alternates between fusing hydrogen and fusing helium.

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