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There is a section of space in the Orion Molecular Cloud Complex called Barnard’s Loop (Sh 2-276) that contains the dark Horsehead and bright Orion nebulae. This image is more or less the “center” of the loop. The stars within the Orion Nebula (on the right) are believed to be responsible for ionizing the loop as is Alnitak aside the Flame nebula on the left.

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/c