ROYAL OBSERVATORY, EDINBURGH / AAO / SCIENCE PHOTO LIBRARY ROYAL OBSERVATORY, EDINBURGH / AAO / SCIENCE PHOTO LIBRARY
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Region around the Horsehead Nebula in the constel- lation of Orion. The Horsehead is the small, dist- inctive dark dust cloud (centre right) in the red cloud IC 434. The hydrogen gas of IC 434 is lit up by hot star Sigma Orionis (top right). The bright star at centre left is Zeta Orionis. Its intensity was reduced by masking to reveal the structure of nebula NGC 2024 below it. The two blue reflection nebulae at lower centre are IC 435 (bottom) & NGC 2023. North is at left. The image was made from 3 photos taken at the 1.2m UK Schmidt Telescope.
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