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The Horsehead Nebula in Orion

The Horsehead Nebula, also known as Barnard 33, is one of the most identifiable nebulae in the sky. It is part of a large, dark, molecular cloud in Orion. The unusual shape was first discovered on a photographic plate in the late 1800s. The red glow comes from hydrogen gas behind the nebula, ionized by the bright star Sigma Orionis. A blue reflection nebula, NGC 2023, surrounds the bright star at the lower left.