The distinct blue color of the nebulosity around stars in young clusters such as the Pleiades (see Figure 11-2,Comins Discovering the Essential Universe,6th ed.) is caused by:
A) atoms of gas emitting light by fluorescence, having been excited by ultraviolet radiation from hot stars.
B) light emitted by interstellar gases but Doppler-shifted by motion toward the observer.
C) starlight reflected by blue-colored interstellar material.
D) starlight scattered and reflected by small dust grains in the interstellar material.
Correct Answer:
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