The Distinct Blue Color of the Nebulosity Around Stars in Young

question 211

Multiple Choice

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.

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