-Refer to the Figure

question 10

Multiple Choice

-Refer to the figure.Why is it more difficult to measure the distances to globular clusters (which contain RR Lyrae stars) than the distances to open clusters (which contain Cepheids) ?

• A)RR Lyrae stars are dimmer and harder to see.
• B)RR Lyrae stars pulsate so fast that they can't be measured.
• C)RR Lyrae stars are further away than Cepheids.
• D)RR Lyrae stars do not have a relationship between period and luminosity.

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