Why Are Cepheid Variables So Important for Measuring Distances in Astronomy

question 79

Multiple Choice

Why are Cepheid variables so important for measuring distances in astronomy?

• A)They all have the same luminosity.
• B)They all have the same period.
• C)Their luminosity can be inferred from their period.
• D)They are close enough to have a detectable parallax.
• E)They are circumpolar like Polaris,the North Star.

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