EUROPEAN SOUTHERN OBSERVATORY / SCIENCE PHOTO LIBRARY EUROPEAN SOUTHERN OBSERVATORY / SCIENCE PHOTO LIBRARY
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Horsehead Nebula, optical image. North is at left. The distinctive horsehead shape is formed by the dark nebula B33 being silhouetted against the bright emission nebulae IC 434 (pink). The glow is due to the ionisation of hydrogen by ultraviolet radiation from nearby stars. Photographed by the 8.2 metre VLT KUEYEN telescope at the Paranal Observatory, Chile, on the 1st February 2001.
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