The Luminosity of a Cepheid Star Varies in Time Because

question 75

Multiple Choice

The luminosity of a Cepheid star varies in time because

• A) the entire star pulsates from its core to its surface.
• B) the outer envelope of the star contracts and expands radially.
• C) the star rotates too quickly.
• D) the star is too massive to be stable.
• E) the star undergoes changing chemical reactions on its surface.

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