Because of the Period-Luminosity Relation for Cepheids and RR Lyrae

Because of the period-luminosity relation for Cepheids and RR Lyrae variable stars, astronomers are able to _____

A) determine the relationship between the period of pulses and luminosity
B) measure the mass of a star
C) calculate a star's diameter
D) determine the chemical composition of a Type I Cepheid
E) narrow their study to eclipsing binary stars only

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