Mizar, one of the stars in the Big Dipper forms a visual double, a chance alignment with the star Alcor, but a careful inspection with a 2-3 inch telescope reveals that Mizar itself is a true double star: Mizar A and Mizar B. Sky-Watcher 4-in f/9 refractor, Kenko NES mount, Canon 450D DSLR,3 sec exp, IS0 1600. April 15, 2012. UP Diliman. Photo Credit: Anthony Urbano