Southern Orion: From Belt to Witch . ... The familiar trio of stars , visible to the unaided eye, can be found across the upper left. Otherwise, the southern part of the constellation Orion has taken on a new look in this unusually deep and wide view First note that the lower left belt star, Alnitak , illuminates the dusty reflection nebula known as M78 . ... Farther right and below is the Orion Nebula , M42 , itself visible to the unaided eye. ... NASA Official: Jay Norris. ...