Cepheid variables can be used to determine distances because their absolute magnitude can be determined from their period.

Name: Cepheid variables can be used to determine distances because their absolute magnitude can be determined from their period.
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Cepheid variables have a well-established relationship between their pulsation period and intrinsic brightness, allowing astronomers to calculate their absolute magnitude and thus determine distances.

Cepheid Variables Can Be Used to Determine Distances Because Their