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Mizar itself is a system made out of six stars, grouped into three [[binary star|binaries]].  In 1617 '''Benedetto Castelli''' first discovered the secondary star, '''Mizar B''', while observing the Mizar system.  Castelli asked [[Galileo Galilei]] to observed the star further, who did and who produced a detailed account of the two stars. Later in 1889, it was discovered that '''Mizar A''' itself was a binary star when he found the companion using a [[spectrometer]], making the binary pair the first to be discovered using this method.  Later in 1908, spectral analysis lead to the further discovery of Mizar B also being a [[Binary star#Spectroscopic Binaries|spectroscopic binary]].<ref name="leo">http://www.leosondra.cz/en/mizar/</ref>

Mizar itself is a system made out of six stars, grouped into three [[binary star|binaries]].  In 1617 '''Benedetto Castelli''' first discovered the secondary star, '''Mizar B''', while observing the Mizar system.  Castelli asked [[Galileo Galilei]] to observed the star further, who did and who produced a detailed account of the two stars. Later in 1889, it was discovered that '''Mizar A''' itself was a binary star when he found the companion using a [[spectrometer]], making the binary pair the first to be discovered using this method.  Later in 1908, spectral analysis lead to the further discovery of Mizar B also being a [[Binary star#Spectroscopic Binaries|spectroscopic binary]].<ref name="leo">http://www.leosondra.cz/en/mizar/</ref>

For years some astronomers argued that the Mizar and Alcor were not a binary pair, but individual stars.  Although the two star shared the same proper motion as part of the Ursa Major Moving Group (which includes most of the stars of the [[Big Dipper]]), it was thought because of their apparent distance from each other of three light years, that the two stars were only an optical binary and not gravitationally bound.  Very recent discoveries in December 2009 by astronomers at the University of [[Rochester]], however, reveal that Alcor and Mizar are gravitationally bound as members of a single system.  They also discovered that Alcor itself is a binary star.<ref>http://www.sciencedaily.com/releases/2009/12/091210092005.htm</ref>

For years some astronomers argued that the Mizar and Alcor were not a binary pair, but individual stars.  Although the two star shared the same proper motion as part of the Ursa Major Moving Group (which includes most of the stars of the [[Big Dipper]]), it was thought because of their apparent distance from each other of three light years, that the two stars were only an optical binary and not gravitationally bound.  Very recent discoveries in December 2009 by astronomers at the University of [[Rochester]], however, reveal that Alcor and Mizar are gravitationally bound as members of a single system.  They also discovered that Alcor itself is a binary star.<ref>https://www.sciencedaily.com/releases/2009/12/091210092005.htm</ref>

==The Star System==

==The Star System==