IC 2118 (its official name) is a large nebula found about 900 light-years away, near the super-giant Rigel in the Orion constellation. The Witch Head has a deep blue color (as opposed to the typical green hue often associated with the Wicked Witch of the West). This color not only comes from the blue light emitted by Rigel, but it also comes from the nebula’s dust, which happens to reflect blue light most efficiently (this same principle is the reason Earth’s sky appears blue).