Date: 1999 - 2000
Several of my students have asked if the Sun began its "life"
as a blue-white star? Or, has the Sun always been a yellow star?
As of current research, the sun began its life as a hydrongen molecular cloud that collasped. This created our Sun which is a yellow dwarf star. It is unlikely that the sun began its life as a blue-white star.
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Update: June 2012