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Ebenwaldhöhe, 21. October 2007, 02:00
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The Horsehead Nebula is a dark nebula in the bright nebula IC 434 in the Orion constellation. Shaped like a horse's head, it's approximately 1,500ly (light years) from Earth, and is approximately 3.5ly wide. The red glow originates from hydrogen gas predominantly behind the nebula, ionized by the nearby bright star Sigma Orionis. The darkness of the Horsehead is caused mostly by thick dust. |
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