Why do reflection nebulae typically appear distinctly blue?

Answer

The dust particles scatter shorter wavelengths of light more efficiently, similar to Earth's daytime sky

Reflection nebulae are caused by dust scattering external starlight. The scattering mechanism favors shorter wavelengths, which biases the observed light toward the blue end of the spectrum.

Why do reflection nebulae typically appear distinctly blue?

#Videos

Nebulae: Crash Course Astronomy #36 - YouTube

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