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This long exposure of the constellation Orion through a hydrogen-alpha filter renders it almost unrecognizable due to the widespread nebulosity in the region. Most of the prominent nebulae here can be found in the Sharpless catalog, such as 281 (the Great Orion Nebula, M42), 279 (the Running Man), 277 (Flame Nebula), 276 (gigantic Barnard's Loop), 264 (the huge Angelfish Nebula above Betelgeuse and Bellatrix), and 263 (the small patch of nebula above Bellatrix and to the lower right of the mouth of the Angelfish). At the upper left is a striking collection of Sharpless Nebulae in the constellation Monoceros. From top to bottom are 273 (Cone Nebula area), 275 (Rosette Nebula), then the much less well-known Sharpless 280, 282, and 284.
At the lower right of the picture is the famous Witch Head Nebula. Despite being a reflection nebula it is bright enough across the whole visible spectrum to still show up through a Hydrogen-alpha filter, though not as well as it would through a broadband filter.
This image is a 70-panel mosaic captured at three different focal lengths with a 694-based CCD camera. Total exposure time was about 100 hours, spread over the years 2011-2018.