Exposures: 15x 15 min subexposures; 3.75 hrs through a hydrogen alpha filter
FOV = 64 x 43 arc minutes
This nebula is located just to the south of Alnitak, the farthest west star on Orion's Belt. The Horsehead Nebula is approximately 1500 light years away.
Ionized hydrogen gas behind the dark nebula is ignited by the nearby bright star Sigma Orinis. The darkness of the Horsehead is caused mostly by thick dust, although the lower part of the Horsehead's neck casts a shadow to the left. Streams of gas leaving the nebula are funneled by a strong magnetic field. Bright spots in the Horsehead Nebula's base are young stars just in the process of forming.
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