Changes

'''Vega''', also known as '''Alpha Lyrae''' is the fifth brightest star in the night sky, and is the brightest star of the constellation of [[Lyra]].  Vega is 25.3 light years away but still has an apparent magnitude of 0.03, allowing it be easily seen in all but the most light polluted skies<ref>http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=vega</ref>.

'''Vega''', also known as '''Alpha Lyrae''' is the fifth brightest star in the night sky, and is the brightest star of the constellation of [[Lyra]].  Vega is 25.3 light years away but still has an apparent magnitude of 0.03, allowing it be easily seen in all but the most light polluted skies<ref>http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=vega</ref>.

Vega is considered a very young star, and is estimated to be only some 350 million years old<ref>http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?1988A%26AS...76..411M</ref>.  Because it is far larger and hotter then our Sun, Vega will exhaust its core hydrogen only after another 650 million years or so, and leaving the main sequence turning into a red giant or a Cepheid variable.

Vega is considered a very young star, and is estimated to be only some 350 million years old<ref>http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?1988A%26AS...76..411M</ref>.  Because it is far larger and hotter then our Sun, Vega will exhaust its core hydrogen only after another 650 million years or so, and leaving the main sequence turning into a red giant or a Cepheid variable.

 

Vega rotates so fast that it only takes some 12.5 hours to complete one rotation, in comparison the Sun which takes 25.4 days to complete one rotation.    This rotation is so fast that observations suggest that the star is rotating at some 91 perfect of the angular velocity needed to cause the star to physically fly apart.  Vega is thus 23 percent wider along its equator than at its poles, as well as some 2300K cooler<ref>http://www.noao.edu/outreach/press/pr06/pr0603.html</ref>.  Here on Earth, Vega is seen as pole on (looking directly at its pole).

Vega rotates so fast that it only takes some 12.5 hours to complete one rotation, in comparison the Sun which takes 25.4 days to complete one rotation.    This rotation is so fast that observations suggest that the star is rotating at some 91 perfect of the angular velocity needed to cause the star to physically fly apart.  Vega is thus 23 percent wider along its equator than at its poles, as well as some 2300K cooler<ref>http://www.noao.edu/outreach/press/pr06/pr0603.html</ref>.  Here on Earth, Vega is seen as pole on (looking directly at its pole).