Changes

==The Star System==

==The Star System==

Both the primary star of the Mizar A binary and its companion are white main sequence dwarf of spectral type A2 V.  Both stars have a mass 2.5 times that of our own [[Sun]] with a surface temperature of around 9000 K, making them virtual twins.  The pair's orbit is highly elliptical, with the distance between the two stars ranging from 16 to 54 million kilometers.  Their mutual orbit, which would fit inside [[Mercury|Mercury's]] orbit of our Sun, takes 20.5 days to complete.<ref name="leo">http://www.leosondra.cz/en/mizar/</ref>  

Both the primary star of the '''Mizar A''' binary and its companion are white main sequence dwarf of spectral type A2 V.  Both stars have a mass 2.5 times that of our own [[Sun]] with a surface temperature of around 9000 K, making them virtual twins.  The pair's orbit is highly elliptical, with the distance between the two stars ranging from 16 to 54 million kilometers.  Their mutual orbit, which would fit inside [[Mercury|Mercury's]] orbit of our Sun, takes 20.5 days to complete.<ref name="leo">http://www.leosondra.cz/en/mizar/</ref>  

The Mizar B binary pair are also white, main sequence dwarfs.  The two stars together have an apparent magnitude of 3.95, normally allowing them to be seen in the night sky, if they were not so close to Mizar A. Their spectral class is A5-7V, making them slightly cooler and fainter then Mizar A.  Each of this fainter pair is around 1.6 times the mass of our Sun with a surface temperature of 7500 K.  The Mizar B pair is separated from the Mizar A pair by and orbit of 340 AU, equivalent to eight times the distance of [[Pluto]] from the Sun.<ref>http://domeofthesky.com/clicks/mizar.html</ref><ref>http://stars.astro.illinois.edu/sow/mizar.html</ref>

The '''Mizar B''' binary pair are also white, main sequence dwarfs.  The two stars together have an apparent magnitude of 3.95, normally allowing them to be seen in the night sky, if they were not so close to Mizar A. Their spectral class is A5-7V, making them slightly cooler and fainter then Mizar A.  Each of this fainter pair is around 1.6 times the mass of our Sun with a surface temperature of 7500 K.  The Mizar B pair is separated from the Mizar A pair by and orbit of 340 AU, equivalent to eight times the distance of [[Pluto]] from the Sun.<ref>http://domeofthesky.com/clicks/mizar.html</ref><ref>http://stars.astro.illinois.edu/sow/mizar.html</ref>