Geometry of the stellar object (photon source) and observer location with respect to the structures in Orion, designated by independent angles α and β, respectively. In this image, the location of the source and observer are shown with respect to the KH features at t = 0.084 (8.21 × 104 yr). The black-white image is actually a SKIRT image at 54 μm, where we see the radiation which is coming from dense and heated dust in the billow structures formed by the KHI. In this image, the observer is located perpendicular to the x − y plane.
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