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staedtler staedtler
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7 years ago
The bright stars at the center of an emission nebula (H II region) are
A)   young O and B stars.   C)   hot white dwarfs.
B)   red supergiants.   D)   T Tauri stars.
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Discovering the Universe

Discovering the Universe


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discovererdiscoverer
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7 years ago
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staedtler Author
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7 years ago
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