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This image shows the phenomenon known as a "Brocken spectre" (named for a German mountain peak where it is often observed). This occurs in conditions that make it possible for the shadow of an observer to be projected on clouds, with the sun to the observer's back creating a kind of "halo" illusion.
This file is licensed under the Creative Commons Attribution Share Alike 3.0 Uported license. Attribution: Brocken Inaglory