The period-luminosity relation for Cepheid and RR Lyrae variable stars can be used for ______________.
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Q22: Q23: Why is the Cepheid's period related to Q24: Cepheid variable stars are classified as either Q26: The lower limit for a main sequence Q28: Why is there a lower end in Q29: As a main sequence star evolves off Q30: Why do Cepheids pulsate? Q31: If you observe a variable star with Q32: Variables of a certain type are called Q129: Why are massive stars more luminous than
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