What Characteristic of Cepheid Variables Makes Them Extremely Useful to Astronomers

question 124

Multiple Choice

What characteristic of Cepheid variables makes them extremely useful to astronomers?

• A) The absolute magnitude of Cepheid variables is related directly to their period of pulsation.
• B) The absolute magnitude of Cepheid variables is directly related to their diameter.
• C) The absolute magnitude of Cepheid variables is related directly to their metal content (heavy element abundance).
• D) The absolute magnitude of Cepheid variables is related directly to their surface temperature.

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