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staedtler staedtler
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7 years ago
What characteristic of Cepheid variables makes them extremely useful to astronomers?
A)   Their absolute magnitude is related directly to their period of pulsation.
B)   Their absolute magnitude is directly related to their diameter.
C)   Their absolute magnitude is related directly to their metal content (heavy element abundance).
D)   Their absolute magnitude is related directly to their surface temperature.
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Discovering the Universe

Discovering the Universe


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hyponoticahyponotica
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staedtler Author
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7 years ago
Grinning Face Exactly what I needed
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