Mizar, Zeta Ursa Major (ζ UMa) is the middle star of the arm of Ursa Major. It has an apparent magnitude of 2.23 and is 82.9 light years away from us. This is the first double star that was photographed in 1857. Mizar is the fourth brightest star in the Big Dipper and the 69th brightest star in the sky. It is the main component of the multiple star system, which consists of two spectroscopic binary stars. She forms a visual twin with the weaker Alcor, to which she can be physically linked. Th...