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The Witch Head Nebula. It glows from light reflected from bright supergiant Rigel - Orion's left foot! Although Rigel is blue, the nebula is blue because the dust scatters blue light more efficiently than the longer wavelengths. (Image: George Greany) ©Mona Evans, “Nebulae” http://www.bellaonline.com/articles/art43407.asp

Orion, Rigel, blue super star lower right; Betelguese, red super star upper left. Beautiful skies.

IC 2118 (also known as Witch Head Nebula due to its shape), is an extremely faint reflection nebula believed to be an ancient supernova remnant or gas cloud illuminated by nearby supergiant star Rigel in Orion.