Explanation:
The life span of a star is quite as many more than 10 billion years. During these many years it would pass through different stages of its life, from nebula to ( perhaps, the current stage) supernova to neutron star or Black Hole.
The stages of the life of star over a span of 13 billion year can be summarized as
the transition stages are
Nebula → Blue star → Blue-white super-giant star → Supernova → Neutron star →Black Hole.