Which stars have the shortest period of variability? a. RR Lyrae b. Type I (classical) Cepheids c. Type II Cepheids d. main-sequence stars e. All have the same period.
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Which stars have the shortest period of variability?
a. RR Lyraeb. Type I (classical) Cepheidsc. Type II Cepheidsd. main-sequence starse. All have the same period.
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