What type of standard candle is used to determine distances to globular clusters?

Name: What type of standard candle is used to determine distances to globular clusters?
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RR Lyrae stars are often used as standard candles to determine distances to globular clusters. This is because they have a consistent relationship between their luminosity and period of brightness variability, allowing for precise measurements of their distances.

What Type of Standard Candle Is Used to Determine Distances