In photographs, the Pleiades open star cluster is surrounded by a bluish haze (See Figure 18-23 of Universe, 11th ed.(in the text) ) . What causes this blue light?
A) starlight absorbed and reemitted by interstellar gas in the star cluster
B) shock waves losing energy to interstellar gas in the star cluster, causing the atoms to emit light
C) starlight scattered by the light-sensitive grains in the photographic plate when the picture was taken
D) starlight scattered from interstellar dust in the star cluster
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