What types of stars are prime candidates for illuminating blue reflection nebulae?
Answer
Young, massive stars, which burn hot and emit copious blue and ultraviolet light
Reflection nebulae require a nearby, intense source of illumination. Young, massive stars fit this requirement because they produce a large quantity of blue and ultraviolet light necessary to effectively scatter off the surrounding fine dust.

#Videos
What Makes Reflection Nebulae Appear Blue? - Physics Frontier
Why Are Reflection Nebulae Blue? - Physics Frontier - YouTube
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