Changes

==The Star==

==The Star==

Gliese 581 is a cool, dim, [[red dwarf]] in the main sequence with the spectral classification of M3 V.  The star is one-third as massive as our own [[Sun]], with around 38 perfect of its diameter, but only around one percent as luminous as our Sun.  However much of the light emanating from Gliese 581 is in the infrared, therefore visually, it is only 0.2 percent as bright.  The star’s [[metallicity]] appears to be between 38 and 62 percent as enriched as our [[Sun]], according to its abundance of [[iron]].  Using measurements of Gliese 581’s kinematic characteristics and magnetic activity, the star is calculated to be at least 2 billion years old, possibly as old as 4.3 billion years.<ref name="exo">http://exoplanet.eu/star.php?st=Gl+581</ref>  More recent measurements of the star showing its brightness only varied slightly suggest it is even older.<ref>http://www.astronomy.com/asy/default.aspx?c=a&id=5619</ref>

Gliese 581 is a cool, dim, [[red dwarf]] in the main sequence with the spectral classification of M3 V.  The star is one-third as massive as our own [[Sun]], with around 38 percent of its diameter.  The star is only one percent as luminous as our Sun.  However much of the light emanating from Gliese 581 is in the infrared, therefore visually, it is only 0.2 percent as bright.  The star’s [[metallicity]] appears to be between 38 and 62 percent as enriched as our [[Sun]], according to its abundance of [[iron]].  Using measurements of Gliese 581’s kinematic characteristics and magnetic activity, the star is calculated to be at least 2 billion years old, possibly as old as 4.3 billion years.<ref name="exo">http://exoplanet.eu/star.php?st=Gl+581</ref>  More recent measurements of the star showing its brightness only varies slightly over time suggest it is even older.<ref>http://www.astronomy.com/asy/default.aspx?c=a&id=5619</ref>

==Planetary System==

==Planetary System==