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staedtler staedtler
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7 years ago
A Cepheid variable
A)   is a type of eclipsing binary star.
B)   is a high-mass giant or supergiant star that pulsates regularly in size and brightness.
C)   is a low-mass red giant that varies in size and brightness in an irregular way.
D)   is a variable emission nebula near a T Tauri star.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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staedtler Author
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7 years ago
Grinning Face Exactly what I needed
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