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Witch Head Nebula (IC 2118). It's reflection nebula which glows by reflecting light from the bright blue star Rigel in the constellation Orion. The nebular dust grains tend to absorb red light and reflect blue light. (Image credit: Steve Mazlin, Star Shadows Remote Observatory) Mona Evans, "Cosmic Halloween Tour" http://www.bellaonline.com/articles/art52161.asp