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The Plough is the best known constellation in the northern sky, except that it isn't a constellation - just a grouping of unrelated stars forming part of the much larger constellation Ursa Major. Most people probably know how to use the 'pointers' to find Polaris, the Pole Star. In this image the Plough is upended. The double star in the handle (second one from the end), Mizar and its companion Alcor, is clearly visible.