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ring(bar -nardz) see Orion.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
Barnard's loop[′bär·nərdz ‚lüp]
A large emission nebula, about 10° by 140° in size, around the central portion of Orion, that consists of an expanding shell of gas that probably originated in a supernova.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.