Because of their greater luminosity, RR Lyrae stars can be used at greater distances than can long- period Cepheids.

Name: Because of their greater luminosity, RR Lyrae stars can be used at greater distances than can long- period Cepheids.
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Cepheid variables, especially long-period Cepheids, are more luminous than RR Lyrae stars and can be observed at greater distances. This makes Cepheids valuable as standard candles for measuring cosmic distances.

Because of Their Greater Luminosity, RR Lyrae Stars Can Be