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NGC 5256 is a galaxy that contains two disc galaxies , that are colliding into each other .. disc galaxies. Disc galaxy. colliding. Interacting galaxy. In the Catalogue of Named Galaxies , it is called Concordia Ursae Majoris , or the union galaxy .. It is located in the constellation Ursa major , and was discovered by William Herschel on 12 May 1787 .. Ursa major. Ursa major. William Herschel. William Herschel. The two nuclei of the galaxies are separated by about 13046.3 light years .. light years. light years. NGC 5256 is located at about 350 million light years away from the earth .. light years. light years