In photographs, the Pleiades open star cluster is surrounded by a bluish haze (see Figure 13-4 in the text) . What causes this blue light? 
A) starlight scattered from interstellar dust in the star cluster
B) starlight scattered by the light-sensitive grains in the photographic plate when the picture was taken
C) shock waves losing energy to interstellar gas in the star cluster, causing the atoms to emit light
D) starlight absorbed and reemitted by interstellar gas in the star cluster
Correct Answer:
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Q54: Dark nebulae are extreme examples of
A) interstellar
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A) hot supernova
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A) a few hundred
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