What Is a Cepheid Variable Star

question 181

Multiple Choice

What is a Cepheid variable star?

• A) one of several classes of stars that pulsate randomly in brightness
• B) a low-mass, horizontal-branch star that pulsates regularly in brightness
• C) a star that normally remains constant in brightness but occasionally flares up in brightness by several magnitudes
• D) a high-mass star that pulsates regularly in brightness

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