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3D Horsehead
Featured on December 20, 2011
A dark cloud of dust forms the outline of a horse's head in this image shot through a telescope at McDonald Observatory. The outline, known as the Horsehead Nebula, is silhouetted against a more-distant cloud of glowing hydrogen gas, which is energized by hot young stars. The energy from those stars is slowly eroding the Horsehead. [Tom Montemayor/McDonald Observatory]
