Last updated on March 16, 2014 at 6:03 EDT  Latest Patrick
Dufour Stories  2007-11-21 13:00:00  Astronomers may have found
another way that stars evolve Astronomers have discovered white
dwarf stars with pure carbon atmospheres. These stars possibly
evolved in a sequence astronomers didn't know before. They may
have evolved from stars that are not quite massive enough to
explode as supernovae but are just on the borderline. All but
the most massive two or three percent of stars eventually die as
white dwarfs rather than explode as supernovae. When a star
burns helium, it leaves "ashes"...