Why is there a lower end in the main sequence of the H-R diagram?
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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
Q27: The period-luminosity relation for Cepheid and RR
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
Q33: Because of the period-luminosity relation for Cepheids
Q129: Why are massive stars more luminous than
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