This reflection nebula does look a bit like a fairytale crone. The Witch Head Nebula (aka IC 2118) is in the constellation Orion near the star Rigel. It glows because of light reflected from the star. The color of this very blue nebula is partially caused by blue color of its star. The bluish hue is enhanced because the dust grains reflect blue light more efficiently than red. A similar physical process causes Earth’s daytime sky to appear blue.
Trick or treat.
Image Credit: NASA